Malicious PDF — malware analysis report

Static analysis result for SHA-256 f926238c22fd613b…

MALICIOUS

PDF

79.9 KB Created: 2021-06-23 11:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ea4bd6ec5a98c05dedce8a7264a0e6 SHA-1: 2de96f6fcc18fd8462118eccd74e4086f6e39a45 SHA-256: f926238c22fd613ba63c7859aa63bba4f0515b392a5a4ceb2c72618d93fe1705
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised content management systems. The presence of these links suggests the primary intent is to redirect users to malicious websites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=partition+o+marie+prends+nos+pri%25C3%25A8res
    • http://akcjonariusz.com/UserFiles/file/51362122350.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/8dut3fi6s3jfb9lpf12t4bp232/jebufimadatulofoxegubo.pdf
    • https://bestofbucerias.com/upload/file/muturepewavokelowisabasu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160712676e3643---62522686939.pdf
    • http://naszymsladem.pl/upload/file/funusoxoranad.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c678f006c61---73069138838.pdf
    • http://vtvxm.vn/userfiles/file/tobopamupaxob.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vq2f1gbv7pl39ijn8ggtt3c0m2/bokile.pdf
    • https://yalcinplayer.com/calisma2/files/uploads/renebelolabiluja.pdf
    • http://ufnk.fr/app/webroot/files/file/29950206078.pdf
    • https://divinenine.net/userfiles/file/xiwafojaxofaxi.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2v76kedmq0map92f3rbaalff6i/wofejova.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4fbd44c1---51023883775.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad931bb6c1c---xokiduzemotovasu.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3993a80a1---68451289839.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb641b9de2---tokoxeja.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s5p8s33dubaphnm96cggj4jnja/kunolofumanitugafovaju.pdf
    • http://wenxuezj.com/images/File/95234212382.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaf.bin
32fd3a33a5d7975bc225d595c6e2f97417ccaa0516c82dd479c09b263daa242a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 5216 bytes
font_01_sfnt_off0000f10e.bin
583d41b7eacfb11259bdc843cbcca1bf4991c195b03ce6ed110ffaba814d9670
pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 13832 bytes
font_02_sfnt_off00011b36.bin
007377d672ad35e960bd13d3f92b574e68300ebd174b34df27fa78aa6545cdcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16076 bytes