Malicious PDF — malware analysis report

Static analysis result for SHA-256 919f21af7b09ff8c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 02:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eef040201d5d2507c40dc775aed9f16 SHA-1: 6fa740586d89af9854e58cb2f6419d6c3f33a0f8 SHA-256: 919f21af7b09ff8c51b9dfe4a8d19a1cd397b3e0c4efd22c32a56ab691ecb86b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports the phishing attempt. Although no scripts were explicitly extracted, the overall structure and URL findings point to a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc4b244f3---sotoso.pdf In PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/debiverawiduvidasefil.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/26314949116.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbc5106c6---jijufozam.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/bf35dc04084b6542495d251a78af9f07.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b68e1a9e---maxes.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/movepudiser.pdfIn PDF document text
    • https://digireg.gr/upload/93192196070.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/88834428750.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/xamataratokexewededipera.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/radovo.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/wipula.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0177299001630709969.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/11069693754.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/47270569384.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021918952318194.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fc513ae4b81d4c2a2354b065610c7888/65539847129.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/karazapuzoritugesiw.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vadupusu.pdfIn PDF document text
    • http://centrons.com/uploaded/file/72115002361318c2a2306b.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/24847016128.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631378940_63ecef780b.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/89637464503.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132443ea7711---pubuwe.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/pivivevuxitikagesajetelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=review+of+physiology+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 18984 bytes
SHA-256: 1edd1280a89026e0c56d63f32ea28d36971509a8e800ef5a592bb6515ab95ebb
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 10624 bytes
SHA-256: 94c79e5e93878706ed131e85d0db54b7fb99a5bc473b719abfc67819efe7d0c8
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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