Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb5adfc7305f6b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 15:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7541a551b23ce1082f936c42e186b308 SHA-1: ef720f6b2d14b41a660f4edc22fe57a277f5270b SHA-256: 33cb5adfc7305f6bdb492034ed7217352850b41cddea23422543b50d2112d612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/gabumovofomatafu.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955d6c3a0---70958206500.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/invd4ik4453rc2sices15virtf/36281727359.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nqj9jmf3n6lp45koks73vlpj31/25240589426.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nd2k40v289ke52pcqo5qkcps95/50405919871.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080964df1df5---mujoburisub.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48d0b4b3---40387930706.pdf
    • http://ministerium.pt/files/metele.pdf
    • http://geoplan.su/userfiles/file/gepivobilujutavitu.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5040edacc0---vujurulawamozuxototimuw.pdf
    • http://sam-global.info/files/file/66010842856.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/63d44d06f7f45606f16ae531917cf6f7/28497185328.pdf
    • https://ajitcoatings.com/uploads/wajukupakigazazilabara.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2b31348f013f4f3e80c08dc3f62a5837/66749756236.pdf
    • https://tonitomov.com/picture/file/rateduxifozigig.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f4b0e40d---1526227399.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6e3qs4cum2r7j2e71ndmjrjh16/sapovebexez.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/94d43147c28926d54187553d43cabcc6/muzusupunorasolasixus.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vu1k4ljath10fblv1ct0hc5nk2/wijojewitememivis.pdf
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/faviw.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/7ff823430f1e2221fd47e46489343a2e/59848720541.pdf
    • http://music-summer-courses.eu/upload/files/vigifukuluz.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846ed27302b---70381120525.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=turkey+mince+baby+led+weaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin
6146e3ff364938801bdcb890c15c64d14a14364e2e71a26594e7438a82ba2f8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 17340 bytes
font_01_sfnt_off00011984.bin
0032acbbb2aba14e5cd84cd8e88ef6142bbbe5b9ccd446154c69c5b5b738701a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 3720 bytes
font_02_sfnt_off000127bd.bin
8529d10424c82b041e032f8ef307ce2f11d051e243e078136f0a94b673c350e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 10824 bytes
font_03_sfnt_off00014085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 16792 bytes