Malicious PDF — malware analysis report

Static analysis result for SHA-256 5752128396f2642e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 20:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09c14dbb6301b992bfb459dd9a8b588e SHA-1: f22a79722f13328cce3293822bc57c4ae7566d78 SHA-256: 5752128396f2642e92803937d4a65e1208bf639e2315a83f7022e323a488f145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24077a7f2---nijidelot.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/sodupogisap.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/77855959013.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3f2705285---rawote.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4e829463---fexofikisevedef.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/nirumunexatogokakobilagok.pdfIn PDF document text
    • http://zaiger.ru/img/file/59638569906.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7is6t0hm4akep1a4uf7ctecide/makav.pdfIn PDF document text
    • http://hbaoge.com/upload/files/71463204152.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/jetirilad.pdfIn PDF document text
    • https://dm288.rs/slicice/file/49703329513.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/349a17db0014e9878941811e421ba8ef/dinafexoxaba.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/gigowifisedilinisujo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e9fe9e56---taxunerajezexaguxixagori.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/805415a9e7a269f3a7d880f4b6efcd6f/55920050718.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/41685329941.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mudofabowalarunofumomefa.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/radikafo.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/soninusomozuw.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/57da865be8b0ffd969b680a41caf966a/40010271581.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3b1a873b68a6cc151e0bfaa66e39bf62/gatuvemufofuwep.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ahg84tln51i50p1q3k21edkaje/kiwininusiluxadi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/d74ddb1c0c47771b312405d28f2130b0/56100646262.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af569e85a5---gusolojawapesuze.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/julakugexatasozevudijeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=physiology+of+a+muscle+contraction+worksheetPDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 17296 bytes
SHA-256: 83328bf00ccbe6251ee4cccdc2abf4c5d651e8575cab459083a4e97b76b35fb3
font_01_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 11176 bytes
SHA-256: ec17fbdf082020182f2d919584a4266f6aa2e22797b0d0db86d1ae858140da1a