Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a9282cc1b72f5…

MALICIOUS

PDF

101.8 KB Created: 2021-07-22 15:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85458e70f998400c7f4a14c4e59db0f6 SHA-1: 54ecb0224c645e0e974eb1e87a3b7caaa05b1dcf SHA-256: 3f8a9282cc1b72f5f8b96b2a202b8ff4f7da59428e25a8ed4a6ce1739e322887
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload via the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236f46f7ac---22657376431.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2a03e0a08---55761074964.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/gimaweso.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d723cd037bd---74041984903.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/83645892367.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9ff523685cdf82ed6c0e67e0139ba16b/zopadegurojewexu.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/kogalajagimukiluki.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/98391538842.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4kpijulcogsubce0brr7s7ptvg/56693534965.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/fojukufunoli.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lefemijifagilusapev.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/vaxite.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/kitukojomiwixomuxa.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3e760ebaee010a48b5c8c0ebf946b1d9/gefakusifilewonune.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mb043r0dquqada7p2f57iu1cmp/72784209405.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25098475390.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39837179076.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075935eade3a---108682528.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/2917239119.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/jovofowujexagoxisotuw.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ad597c0b35ad988937f08612e1878397/9364544701.pdfIn PDF document text
    • http://sakem.org/userfiles/files/95433699491.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/50567561053.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/94119089130.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/26e50063990446e3b4b377fd87a4e161/sigafogilup.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t3p7tuinb6q4gft8u0g1g8s0r7/57739539894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=old+crow+antiquesPDF 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_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 17652 bytes
SHA-256: e0c036d2b09026686c696d295e2fee520cccf6c5eb98abad2c4336211d355e1e
font_01_sfnt_off00015754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6B 10720 bytes
SHA-256: 434d42103e1d461bd068e5ca9411d77c9e3066177edddc65578349be950d12a6

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