Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a4430d809ee866…

MALICIOUS

PDF

120.8 KB Created: 2021-07-06 15:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3dfae92b35b4c5326f678900e7b86e24 SHA-1: 5678e637cd3d3a6cd8ee807d4e68e3e2bea0f3b4 SHA-256: 41a4430d809ee8664973612db828a087fb4f8fe1077abdc5ac0bf695a06d4980
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/71moaj46v1kijgot7ecmimii7k/serarafubinamaguves.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788a56201f---84544659407.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sotamidimotuvujuxubip.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dfecce8eb083949be1d28ead57c49c8c/8277122660.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b3ee5iciaat7rj6qk7fvfr5p2t/98994692616.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/jofiruxoti.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa024f6a2---gakilifunu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca3ec50ed---binamikejepiweziz.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5df71d8e32514c2d3fdaae4e32100f40/89425254277.pdfIn PDF document text
    • http://oodow.cn/upload/file/210626081149344070cpgs88y12u7p.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7675acf2---21707378048.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cvvt2qbumn24g7bssj0bokhtqk/25652568773.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160719fea2ada5---21474682542.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/gejejakiz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c282378096---48553473971.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pd9656o68kvbfr6c71ti9fjpm5/49679405769.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jawamewofozibirasunapise.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wakirarofosomuwukuvanow.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3cc6ecdba925d4a2881e3bc5e3c68f8a/tusiken.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0bb4c545664f44bb98dc1a8a2c482e8b/xorenuwixolebaduxevufole.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/493fd934987f09be3977ba23d4279cfd/97320023997.pdfIn PDF document text
    • https://luminex.pl/upload/file/bigererinanozobubed.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93ee62675---28640114481.pdfIn PDF document text
    • http://lucann.com/Upload/file/6145436327.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a9378bb72---fawenav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wikibooks+nvq+level+2+carpentryPDF 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_off0001772f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772F 11040 bytes
SHA-256: 08ebc029d013f2da0347f77af7ec94adaabbd50ba6aa180f4e099b7c22e6a46e
font_01_sfnt_off000190e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E1 17304 bytes
SHA-256: d69bd0ce0cce86a86a1e3e183ea547b2d77c5acfa0843975a379f4fb7cdc1162
font_02_sfnt_off0001bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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