Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff1490f4d737569…

MALICIOUS

PDF

89.3 KB Created: 2021-07-18 21:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fb3efc1640826ceab7d7048ae988601 SHA-1: 7cffba4fc068441dbd6835f6d2163b3b01c2b6f4 SHA-256: 2ff1490f4d73756902d3848a4a7b150376e088ed30ed7d36c3a571d2572a0150
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30abfc678c---11528323702.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e88d9cf77fae834e109bde7947d4f972/47742870581.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82f11be1f---gabetuvirogisujasogiviw.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/88273910476.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/supatumetuveve.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sowomejosamuxevar.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/zaketuw.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/gofavul.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a6836932679147e82a75c08bfdca367d/82889141221.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wedifow.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/17221451243.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/22907357454.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/namuz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79184929442.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ce38000b7136637be1fed3535c0678e4/2947346263.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ed3b9f81fa66b794e87eaa8319cf08d5/wokedijaxenuta.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nevijexe.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3022ea757---menakebe.pdfIn PDF document text
    • http://93564497.com/userfiles/2923088198.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nadirexutuf.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052213285127.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a73fa070335c79f7ff1bfd4b147f4cbd/perunu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081115c72989---torojelat.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/zukulakepuzazedewilopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ceed+sample+papers+with+answersPDF 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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 18000 bytes
SHA-256: 16c63912b68115c605cd6811290f1849d11ab1f6c91dd389e0a5af86b5727c0a
font_01_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 10656 bytes
SHA-256: 6f04d99a3abf0727704927aa27e7d5812b8742a1e1f00dcce762e50ba7140b85
font_02_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1