Malicious PDF — malware analysis report

Static analysis result for SHA-256 a444ce585698a5cd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 19:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c458de8a7654606b85dcd1bc1b77040 SHA-1: 12f0b42256f1228ef9a1d20798b48ee026652a19 SHA-256: a444ce585698a5cd0c92e1d0347ae0758dc7154162cf50860127710ff7487780
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ce9e02ff0341a7de8ecca12d25be9362/73961768288.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/29607085158.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/taxilakel.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/50462541174.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/wepasofiriji.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/kigegezimagefubofukaxef.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/89349472233.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/zufajafexoga.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/81360000890.pdfIn PDF document text
    • http://arucax.am/user_images/file/wajilodinutimemub.pdfIn PDF document text
    • http://orderkai.com/uploads/files/4364635396.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pudoredepirakatuve.pdfIn PDF document text
    • https://haidangpc.com/contents/files/nafapemoxavidiwanuvepi.pdfIn PDF document text
    • https://photojet.net/userfiles/file/jirenefimevo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ca69dbd---26904763552.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/kezeguwakewegiretif.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/53732352007.pdfIn PDF document text
    • http://inercial.es/uploads/files/voziwifexapup.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21091207051218984584rtof.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/df78b084d1db7bd195e12b04f9704cc3/nikisopoz.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/beguxupetazupotaruve.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/16437409789.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/vigobemojoworotebov.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/vagejinafuxelaremevew.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147e327538d1---39372935717.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/32955730044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+gta+cheats+in+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 16424 bytes
SHA-256: ca04f426bd788ca51ad9f756ff2ca9951b9e1962db3b0305da170507c42fe1b5
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 10780 bytes
SHA-256: d2c4e2117a3de81f314a42c0f7bd28795d07d4c96e4e0cb900f75c63b699f8fd
font_02_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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