Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bcd89185c23a43…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 01:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d718a904143ccf67e6cb7211302f5b2 SHA-1: d9289f6946baf1990bb7de7bbea2b0ff8484b8b4 SHA-256: a5bcd89185c23a4327a85cf8321dd80c13d570c2b1a601c760c96520c665fe7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting, 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 PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://interwork.sk/userfiles/file/fapis.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0317e32---zadavewojasi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/xulemenopekukesorezemegox.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2ajtdb3cheaqn0ijpo402hq03h/dunuwujabopo.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089344c49585---25007267295.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857d08b232---pitad.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v1hkj5dmsg53e2ji6b19ahv2us/20826651798.pdf
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/molevetotimegoxulom.pdf
    • http://okuninka-biale.pl/userfiles/file/wowosaboveduburoxod.pdf
    • http://jiehuist.com/userfiles/files/37971831857.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf68ea7f32---vifedoxuraxajiwogisukube.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bb0d33c60620d3698464ff7f94e07eb0/vafodolaluwofitokirejazu.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16073224dd333d---jowuzikosorurorojis.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1028abf3c7d74117a625846033e867f7/nikagasipedejodopag.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071986595ab5---48243800151.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/peromutanokilarefigujedu.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5af2ee08---lumagukejegiwulonutikoli.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a00516cbc57d743998555ccfde15713d/xowob.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltqme1a78rd358r2etagcukchg/kuxesanobimixovin.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ofhfjo9rotat5dlbl145gvp362/61224889194.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d9454ac9244---55612612360.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753758e98ba---jomix.pdf
    • http://baloneacessorios.com/_upload/file///zitopevezaw.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607230dab4f77---wejuzuj.pdf
    • http://bjjiffy.com/upload/fiwitil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=1+mole+of+carbon+in+grams
    • 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_off0000ebf9.bin
ff1abe5e2037185351788bdea4b6869c2591a8a5bef1f6f04edaf3cf3f5c2628
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 17548 bytes
font_01_sfnt_off000119cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
font_02_sfnt_off000131e2.bin
133be8766d0eabf8eb17f36adbad3bbeec654d160f574cd73b38d8e23f0e3744
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10676 bytes