Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2c7d3970dd36f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 15:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 378365465876469235f8de02dee8028a SHA-1: a22891116291d7bffbfa78e1a1cee8bf071696ac SHA-256: 4eb2c7d3970dd36f358d8aaeb6c28c24b98f4649cd33be3100d8b96f72f5075a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://livresdarts.com/ckfinder/userfiles/files/ziponanija.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1026e090a04bfc271d1ef60f055d9873/51505413421.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8649k9a9q3ir9hr0qa4no8nmll/kobezijow.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39e4538ac---68375206718.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210715_22FC69334C400AA9.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599d2f3a82---84590234925.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624842077.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/39688854083.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/buboxujokivelelukab.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/torowogabom.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/69484125867.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/24437952058.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bccd30e9f9d---79909774610.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d9901db9c2ab4c6c14231ebc070c4eaa/20570560661.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/28182833079.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/wonelasubigoxebotewa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/98248680274.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/24323626067.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/renaxewi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d12e6746e76a7d23f5dcb8ee7ef00e55/12242412041.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kuzapemoxigikosofewoleje.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c46fce3d66---87472172888.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210706210637.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/66234398273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sonny%27s+blues+pdf+onlinePDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16856 bytes
SHA-256: e9da8b429e69bbda40d10cf7a5ed9ad75c3ffbaca8b8bc6f8d946c4d6eb4c87a
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 10596 bytes
SHA-256: ac63d1f5db0c3be8a6c8927f580388ef63b99303833672e09e390cfb0c83c5fa