Malicious PDF — malware analysis report

Static analysis result for SHA-256 285aaa85194bcb0a…

MALICIOUS

PDF

88.2 KB Created: 2021-08-03 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 84521d237fad653e077df7545757b6cb SHA-1: 636707e885353153fc5b584bed681738b6684be5 SHA-256: 285aaa85194bcb0ad92719e1812b8240df41853abe68cf0f0f65dc8fc550f8e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://infrive.ru/uplcv?utm_term=tecr%C3%BCbe+taktiklerle+paragraf+yorumlar%C4%B1 PDF link annotation
    • http://absolutelyneon.com/userfiles/file/54843218045.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0c8a64917d366f81209e1003fb883273/82041072790.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gedobovubebexogodijab.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/xulekozupakovazubuge.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/2289362241.pdfIn PDF document text
    • http://poorclarescork.ie/images/7802625017.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe7116b3cb---mixoganifikaj.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/94937afd00437955ed88ea910d89c34e/98851574102.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/fujoxorupo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/583d13bda025b06c93220153d7459d15/83392250354.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/monotupisumobafedonitaka.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/11784718815.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q8nlqs0s8oqmv79f987lb53425/xunerubafuzipugugizone.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/zezigekubijoni.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a9607b79---89031749871.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/87276620497.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/7413753106.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/terijazopelaraxokaseke.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h171tckl04l4vkcqp2lqg1235g/masatetujafojujini.pdfIn PDF document text
    • http://huiking.cn/uploads/file/180131572668.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c702482401d0ceb0610813fd3370651/86874216797.pdfIn PDF document text
    • http://praguetransfer.com/files/file/muxafuxu.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/tivavuwobowamesapefugaj.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wudigawomorazozetaditabi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47beed670b---75784420963.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/xugiwaxub.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 11196 bytes
SHA-256: a1943bede179f0005e37104f20047574ee2f8145106f67a5f1b3aeb62c130d6e
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 18892 bytes
SHA-256: 5e04ebabf13dbd679b79bc489b3a1d2d45a3f073b33260310b83487824d7a28f
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1