Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f2a464bc8f9224…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 19:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 779294a29a59e94033c4d2c34aa3fef0 SHA-1: 59ae5de9178d249c4f9f1a1a831bea4a304eff8e SHA-256: 43f2a464bc8f92242fd2cc5a053aa9e6b24d1ecf1c4de2ec0f2f5786a678c91b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, some of which are hosted on disposable domains or use WordPress upload vulnerabilities. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614356f2b85df---nevuxozuxe.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/xugilojuzazu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/narux.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/zupuw.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/18656220168.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613878f1a9582---29142471452.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/16038593866.pdfIn PDF document text
    • http://steinemann-ag.ru/69648814143.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/78729762325.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/farumogemam.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613475bd8d910---96091568500.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/pivigijugiru.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad962d03ff---toluzabajurulolapegefe.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/31060120234.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d54b7e10f2102815b10df423fcb89600/wojorinowanak.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gugopufevivavunosuruvu.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/97406270275.pdfIn PDF document text
    • http://polipack.ru/content/file/tixuweseponuzafimuzi.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/3765175708.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/dasedup.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/34140281449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sons+of+anarchy+pilot+scriptPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 10636 bytes
SHA-256: 8245803a9d664ced713bd94edf2b7f955da9c6375a62d8a5d4edeb87ba1bfc34
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 17072 bytes
SHA-256: 70482f1d3393c40c1105b7fc69edb5cf1ce0df0b6c6a74093edfa1ca66a890b9
font_02_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1