Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f91f6e8846b9c5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 07:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f4331da923ddd9cb7c2d6925706fd9e SHA-1: 6d878e1bb829dea281d1ca3d2c73be46f7997fa7 SHA-256: 67f91f6e8846b9c5d7893dc6c4ea40991bb05bad2bf0fc4defd09b376f767dd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c68ef645f2796b6c7b85ddb405a2e5a1/wovadolokikabifekowupe.pdf In PDF document text
    • http://dragonera.cn/admin/userfiles/file/tafowegativarojinezo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/95347478405.pdfIn PDF document text
    • http://eva.am/files/e7a8a94891d0de54.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69ff85cf4---nojisowalexemomuzelevadid.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210508130717920847416.pdfIn PDF document text
    • http://poultech.net/d/files/50523043663.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/naxoxinuruxakitomaju.pdfIn PDF document text
    • http://hadt.vn/upload/files/nesuben.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0srvppdlfives68oh19mugghi/tonidaragalaxagutek.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/91340933274.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/82991679179.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/xobupitatuwixozi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a3844f13---mazepedinujubariro.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc486acc85---30323572433.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/05164013171b656d6f23f8d2425e49ab/wiwatobe.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/memenibekododomukobuxokug.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/33063347967.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee674d138---vivanikeri.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/68538173046.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/gufigolilurikulibebe.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/65792134874.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/fekuwozizosuxadikedum.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8571cd3cb83ea3e45ca60f9e62bd52d3/lativorepufivisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keywords+of+present+perfect+continuousPDF 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_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 10696 bytes
SHA-256: 40949bef068cfee284d8841aa1f45b0e3881ba9384a26182bcbd5de9a745bf43
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 15996 bytes
SHA-256: 711d1c6eaf064fc8f4727f98d911c3e38506dcbe9462862339d3d32b3ce5e564
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1