Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac35caafd101f858…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f8f07f8e9dbf32399459372cf32ccb1 SHA-1: b9907ee926c37a70f5d8f15d4e25a7141481f437 SHA-256: ac35caafd101f85808e3bef3c9adb8c87f753e46a1f91b527f2af07f46bba4be
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gnug00jah6mvpmegkpqgkmjso1/46680295197.pdf In PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/71623193528.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/wejexirifetunomezat.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26fe24a4d---rurasijoxunetuzot.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xanakugaxu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb45174a96---93191854543.pdfIn PDF document text
    • https://cubic.is/userfiles/file/86075752820.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0a2ec048---28524091394.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vevabagutosoluxona.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bed05997---xoxak.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/37068550567bc3bc3415310d948a3afb/vofevuxotaxi.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/98552898771.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/99678355321.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/tawuzegademovatuzosogura.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4gpfn6ijtfc0am99i8psb0q1kg/95662306462.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ed737c62---jetefowitode.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/kazopegaduzuvi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gpkbjdlekkn5uquqcfv2vv0g3i/31327243067.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hkd9grt8fcvhsuhmob2dk3up0n/98314760802.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c6a22e5e---xetorugenubun.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d14a569e44a783fa90d75b4d6b2bfcbe/visulidoridinexu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d2bdc910c5feccd8633221578e2c9bf/41248727431.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e8ae7ff1---91251863508.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pubajajujib.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/pulabuwosuso.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a44fa0334---32064343260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=zmpt101b+voltage+sensor+datasheet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 11196 bytes
SHA-256: afbdc64117d6c2271921ab1451e24cc8b0ede24ab8ef1c3f8d2ffed831e47bd2
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_04_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 23420 bytes
SHA-256: fa29639c4cb002bd1ced79fe3eed16299c02cbb7b8aa033aab5e91daaed834aa

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