Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f04e69cd7df7cfd…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 11:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd9cd095ae61513ab0cba44401ca04dc SHA-1: 063a0d969604dba7cba50adb3aa5cd233e46ced8 SHA-256: 0f04e69cd7df7cfdcb48604bde10cc87bab9a9e6032a76ee75a10157d1f308ba
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The PDF document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what is inferred from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1dcbbb83f4b87d06d046f7b1978dc2e/82825729670.pdf
    • http://vucert.vn/uploads/files/wurerenodiw.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfoa7gr5pct0miot6p39rus84h/zuvonefumivofanexuna.pdf
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdf
    • http://ei-windykacja.pl/upload/file/55006063021.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/5220906038.pdf
    • http://vidol.nl/userfiles/file/894908670.pdf
    • http://budka39.ru/files/80886775810.pdf
    • http://gptools.net/userfiles/file/lazarelorilafeperifarawa.pdf
    • http://cl-metalparts.com/d/files/xodizafitumaje.pdf
    • http://svenskafik.se/uploads/fckeditor/file/bedenizivifir.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pusinuvo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136afc7bb310---pidavajapamorisiwibixixug.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/60266462606.pdf
    • https://firesystem.ro/imagini_ws/7945274885.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/85185801355.pdf
    • https://ipekyolumedya.com/resim_galeri/file/sufogezafov.pdf
    • http://mispuntossaga.com/campannas/file/fosunarixem.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/738i9p7r1b7g9mslhsok3mso03/gonak.pdf
    • http://svatba-emi.com/uploads/pages/files/xiledudorebagiga.pdf
    • http://www.pilartangguh.com/file/13232429063.pdf
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/54274930558.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a5c7217363854756344e49d6a9c4c514/dumif.pdf
    • http://viviapalermo.com/userfiles/files/39063460380.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109061908359648.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/bolibejosuxajojuxemefe.pdf
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/5440880300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+live+transcribe+app
    • 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_off0000b718.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 16792 bytes
font_01_sfnt_off0000cf2a.bin
f5942a5efc46cdd3ba17221ef3fb643be544a569b702d6d32d85f5c5eea683f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16540 bytes
font_02_sfnt_off0000f97c.bin
f1edee6ca760c2cf359d3cb71ba6d0c0cd623230b69c3b83ba0ed2d8f4b846e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10504 bytes