Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a9d22ff682cbaf…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 09:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9f126f04693627b71953926a3a983849 SHA-1: 4b9d0e83eef7c51b065b2c33008784278ec10fa2 SHA-256: b1a9d22ff682cbaff042c2c37eccf3319ee3ecb666f6ef9d8c1c0ce0e70c3e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it functions as a link farm, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=kenwood+multipro+fp735+instruction+manual PDF link annotation
    • http://terminsk.by/pics/files/29918363741.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a260535dadf---41716484464.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/62406202926.pdfIn PDF document text
    • http://dejede.com/userfiles/file/30669964768.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/redaxobakof.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/99333639578.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab465d73122---kazefulabol.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/67295186160.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g2l1u8nltmr82qejgeh3unkiiq/jivukaniguzab.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/5298955178.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/salorodosolukubojoteruteb.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/85676575188.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dvr45buhsuso6vu8lpk0q3t99e/50535232558.pdfIn PDF document text
    • http://lotte-ppta.net/beta/assets/file/26509553713.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/zenuletonukogawevotixot.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c85e7767e3bf07f897973c5ed53801a7/navurorivogogebelo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p4s46d72uq0rvfvhctjtc0dnp3/poregokirinikofugisojed.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/44118959731.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c6742202---40727004431.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210729_144717.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/57919002659.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8bfb4815ea1e9564feb0b06bb5777963/pizum.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5944a32b24---lorolewawigidulifazum.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 11316 bytes
SHA-256: 27e9528024f175ca89500b164b8c80e5a51d72e5dd0aa4f09820c298aa1d29b7
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 18460 bytes
SHA-256: f0de462ee3716a523d4acb731aa3a3f023ef68664df167976bce41e7f751c62c
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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