Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d225b467d4b9e6…

MALICIOUS

PDF

128.1 KB Created: 2021-09-08 01:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6d81e24b065b3806bd2c7387a14092c SHA-1: 95342316d786b2f0dcef4b555fff5037b2b4c652 SHA-256: b3d225b467d4b9e6f7cf30445e96b4b7c692f68649739bde9d7d58904c6a56c7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to phishing sites or download further malicious content, aligning with common PDF-based malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=glow+eindhoven+2018+map+pdf PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44943657ab---10402607347.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/140951094355.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2edc2cd0725c12a160b8ba4c2c20843d/44461572308.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xojazisul.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dbff0a718---sabibufaxawigata.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oq3guos72v9q7arbg1o619qmu7/wawizuz.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f3ac21bd88b152335b9ba9c72c0ef0e6/neximobukimokagat.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/dipjatcrrhcmefiifara29j1s4/63918939500.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/54654250109.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/40ed906aa26847ebcd49596b62d056e6/939655117.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d239e90eb20---97667611664.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/poneludopotib.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b04015f5a6fde900eb692ff720d6408c/70353503286.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c505bc8a492---memotedevujuvuludobito.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/11043762774.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/xunonekipivu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/mexugiza.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zatizatefadawi.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/78148222691.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/80790063906.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53479417df---39623352261.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/94505395020.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b1j99fs789vr11891c8rfd6hv7/sofipen.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/87255923962.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_off000193d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D8 17244 bytes
SHA-256: 959f90936921774187095f477b6152f1970f19675e05ddf7d634f8058f783209
font_01_sfnt_off0001c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C097 11092 bytes
SHA-256: b9e498384446956014c0aa4cadf890e07258a531764604c214109e290e8ea6c1
font_02_sfnt_off0001da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1