Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e9e438cc503eb4…

MALICIOUS

PDF

61.3 KB Created: 2021-06-23 09:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1bde496aba38eeb234688f41853910 SHA-1: 0aebc657e60b8532786d6a5c23ed4e6841ff0dba SHA-256: 28e9e438cc503eb4641f230fa89dad7166819cfe4b986f8ddd996e72e4514e81
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable or compromised domains, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b6589e559d4b59ccb99af0521100d3f7/vanasaziwejev.pdf
    • http://jarosi.hu/files/file/baxivurovot.pdf
    • http://palami.by/images/file/muduxatizavanufugi.pdf
    • http://sarljarry.fr/userfiles/file/sizipukufomebadevivasuk.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/8709636791.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ec286b68cce2aa42bf6f4154cd7d4b05/71196304913.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607016ecb81c2---mukupile.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0b3e1e43a9f7b3aa2a3ffe82af609f36/rakikelefuweluje.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/mildkod2k40of5kmkn10bo4t14/nufejerabok.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rpe2g3en5r02biqn2bip1trbg4/42405973565.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/def93c1af9c2bced33efcfedefab65e2/21631649652.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2n7cidqgdkb59of7eu902dg853/19910346615.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd51878cc---73259663564.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c5808d8bd00ad56c22ea5402986d3950/fukafinipepevasomedov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dark+shadows+putlocker
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf42a72dece---pudiwefokoruxemologaxop.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9fe.bin
41cc21ce60a0041fbb26045b0855fd0910a8da55d0b617315abaccb59d049450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 5316 bytes
font_01_sfnt_off0000cc29.bin
e6eef3e49d4d017253f0a5b5686c8558133ee377868627a60a55066386fdc2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 10924 bytes

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