Malicious PDF — malware analysis report

Static analysis result for SHA-256 3620e8974ce29787…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 08:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5a8ab429dea07bfb83f76a445f860fd SHA-1: ba271da20bc24f08eb09b0e5ac53d90d746b64fc SHA-256: 3620e8974ce29787760c2bba7e4984aa2173e1945cb4c66cae864c636819d5bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=blokada+slim+adblock+apk PDF link annotation
    • http://llux.vn/uploads/files/gajelifamabo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/dasan.pdfIn PDF document text
    • http://protok.pro/upload/files/57892412530.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133029077d88---kazagajakazalumaxosimeb.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/19832530589.pdfIn PDF document text
    • http://asvpp.fr/pdf/85042520980.pdfIn PDF document text
    • http://insei.eu/userfiles/files/62025327594.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xamolu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/buzagedidekatet.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/filivifejun.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/71811773774.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9993d8fb---45458412612.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3aae876c---wivozepivufikitesiruj.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/fixazuwerodejika.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/37127948670.pdfIn PDF document text
    • http://medica-brno.com/files/59495596037.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/joxog.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/wiladiwolev.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/24421550360.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/50648139228.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wejekol.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/wowiwuzakek.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/xititeb.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xevemazokenix.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/96871572307.pdfIn PDF document text
    • 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 23132 bytes
SHA-256: 809cb8606f4b4e237d90db344138e79c6b838a9ceca180bdfff7fe495c603de1
font_01_sfnt_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 10528 bytes
SHA-256: f523161090a2786a86ce5e721a7a9b3f07e4c693f059b01f4f6388d1aaac53ea