Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5f612b42c96466…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 17:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 603491080bf7d20271ad55a837335b11 SHA-1: 0a354dff6d0254dc9200208e9592e1c2e306821b SHA-256: 2b5f612b42c9646608b08393675464eaf036f793f92e936fb3a4ec9e67a3a2cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=first+aid+trainer+wow+classic+150 PDF link annotation
    • http://alituncer.com/userfiles/file/53028618768.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t1g37jsp9uka329mu1a2ccjjqv/noragedagutimi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0644ce4353---66918429029.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/eb74cbcd43def82bb5cc00b2c44b5b2d/vegigaje.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3c239e5a0512959b1601b9d1c0f8425/golezinalazir.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bvdgleorac3r373uka5pac2ahg/memamoru.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/dc44f6c3213327405bbbb1000497a20e/sosirov.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994f9b24662---rodurevupalonipab.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/72086733337.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/10104828339.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/le61q95l8obm8f1mqshvtkgnjj/ratis.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaf20ece7---929710133.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/d7vtfeqtkl8lfpmpctktqv9fr0/74549133508.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/11929594019.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160936cf663f77---39366066437.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/69763844968.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e037apma5d5v6kth1lvtr9mrja/nirun.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df467493---taluwi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/df753248c080ed525677a8c068a634c6/gisizizemigotefuwid.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/heefgdb1qgan6gs2cla166bb83/96395280457.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff5774d3bb2d6d32057ac38f3c698102/wafanemapur.pdfIn PDF document text
    • http://contextuae.com/resimler/files/jubamomikanapufufeb.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fotagew.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/94950191988.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jupepepapogifoten.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15642e7c---19625270517.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6cad9f2109f98ffbb5ebc80b6ba11151/86684218773.pdfIn PDF document text
    • 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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17196 bytes
SHA-256: 2b06d29ec29e208cc5aa14d4ec7549b90bd8c6bab2fe1e9e629856b1b66595b8
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 10736 bytes
SHA-256: 3900da8865a04156d8f9c3dbfd4cca1ad91446f3a7b903fd8fc6d3b42929b33a

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