Malicious PDF — malware analysis report

Static analysis result for SHA-256 0521f42290c74f83…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 03:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ffd00730eeacc75075813b0d8edfdd5 SHA-1: 31aeab01b1711a8b4ddb382d8629140e89350334 SHA-256: 0521f42290c74f83359960f0ca9708546723f0faa3afe409e33afdc7c1e2cb03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=como+ver+notificaciones+en+pantalla+bloqueada+android
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/tisizo.pdf
    • http://daehnfeldt.com/userfiles/file/vubafuvusuwasofa.pdf
    • https://musikkursus.dk/userfiles/file/fukug.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/xujomawarinogebetizoxo.pdf
    • https://haysalon.com/public_html/userfiles/file/12505537083.pdf
    • http://acrclubinversores.com/files/galeria/files/86123016626.pdf
    • http://888chji.com/userfiles/files/peludokikivuxe.pdf
    • http://zgic.ru/!upload/files/72876484961.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cce5e73ef7da29f6f4514ec70fda112c/75547987861.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/69518601875.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11982630244.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389ab409216---66870847149.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f949ppgotcbnqtmqbkcars7987/kokabekaxo.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/jenazidagegazivirise.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613329c1b33ba---jinozanava.pdf
    • http://ketnoikienthuc.com/upload/files/73488535959.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/68099644780.pdf
    • http://emannsltd.com/userfiles/70488432106.pdf
    • https://renesens21.com/ressources/upload/files/wizoxisilafoje.pdf
    • http://alimentosldm.com/userfiles/file/15773498887.pdf
    • https://thefertilizergranulator.com/d/files/83363231389.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee96b2c1b---59715970170.pdf
    • https://clove7.com/userfiles/file/savinelamuzerokunigipago.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310417d00b7---31308235478.pdf
    • http://gekon.net/userfiles/file/67739116413.pdf
    • 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_off0000deda.bin
adcf4361ce1fc003ffbe6fa05507ffe7868e3f5a5258fda9a2bdd89c4d8553e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17948 bytes
font_01_sfnt_off00010bb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
font_02_sfnt_off000123d0.bin
31789428bc5d5ef6ca4bc26ffc357d97511e321a60c7f92657c111fcb7021194
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 11264 bytes