Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ceed6879ba31f4…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 11:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a80d315b4ec98e62be2f546ae26fbbe7 SHA-1: 0b9ac78d513e4939ffd9fdc943015f83a64cf958 SHA-256: 56ceed6879ba31f4eb19b3f1fbd9864575c6a55df2c3cc5b8a7be4bbacce9c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of multiple external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=an+electric+charge+q+is+placed+at+the+centre+of+a+cube+of+side+alpha+the+electric+flux+on+one+of+its+faces+will+be
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/chkga4h865nreon3kaudnv2v86/11575210544.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/motepebawaduruborogit.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2965d3c961---71931431219.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5569aafa193daf1dff2daa8cfca8a48/fabibavedalazu.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sb6rhho7tu9kf24dj7v9sbtskf/xukuwaki.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7fc8072bf35627bb20451144e74eaaca/bonakidipewufaroxerab.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tnu4doet8sqvc43k8e120nubf6/28580881900.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588a77733d---23248684589.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e889754a231cd96bddcd20b7e90df3b1/woloxegeb.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e0908109ff4b7dc3e715bf4eebabbc88/40254554569.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolofizelozexezipez.pdf
    • http://rauvuonsach.com/images/uploads/files/52998467824.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/93054777806.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7f7f92972b2431b5322d1be13f3b0572/77929734399.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/afhg0v1hqtpigk4q0vagb4dr16/bufigajogiwixuwiteki.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/94d5d993953ec605819ee6b1f607a8d4/93950471296.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c466a5a5b68---13049232764.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2a7ea1e096c8a5250dc3df43bb3792d4/naragonizus.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/nadukodolujupir.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a31934bafc7---rafafeposunomigutiduk.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b994a1ae3e---60282660626.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/14d88cff909fd18c4647ecf9def2ee4b/9128809822.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 16792 bytes
font_01_sfnt_off000114ca.bin
f5e60855b7fe742441810f6dc8e6c2d97c95652cd8d6dc5a9ce894c1aa0e6012
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 18692 bytes
font_02_sfnt_off000146d1.bin
f15800f5dc50b63499480aacced9c1dfed4a4f36b9955dc526e126bcf52c3cca
pdf-font-stream PDF embedded font (sfnt) at offset 0x146D1 11452 bytes