Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf2f71bf7979fe9…

MALICIOUS

PDF

62.5 KB Created: 2021-05-31 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8e40425f4dd1f146797ac18e8735336 SHA-1: bb7d8e0fbf8076369018b091b60bfa795ba380a1 SHA-256: eaf2f71bf7979fe9a6923771c309de885a12278692957ba1c6dfc6e76a2f2aa5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm heuristics point to an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8320

Heuristics 5

  • 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
  • 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://alarouba.com/ckfinder/userfiles/files/76483423128.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0d4cdaf54c97917bf8e7393fb08a756/jonumifotenavupixevino.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64b6b5a13---kojufimifexokaw.pdf
    • https://rocksoliddesigns.biz/userfiles/file/xedexulexaliwedilik.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5d0c35b251b2afccf6676147c79e2875/40314162109.pdf
    • https://fablab808.com/nbloom/fckuploads/file/surozaderikajasef.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20a736a69---85595103142.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af2b5a54674---pedofif.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609730de99a00---76215509915.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8j8hp5079q18u90bmnqiigu9aq/gafoxolivebitazikatizezig.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5847ca6d2---3242986127.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7502ca4d384d1b549a94a8e40a637f34/66200667317.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a78a367---23880575361.pdf
    • http://onlineticketreview.com/images/file/9879042050.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf3546faa---borasedutemabijawabesarer.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jigugkvrmtr483eej2sklsrlqn/mafedowemesupazonususoso.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d907a3bd2---duzugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+connect+a+car+battery+maintainer
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed60.bin
965ebf620a1d591f56f8c3c196347372c5cb1e8728ba82b09a18ef8762a6e163		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5028 bytes

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