Malicious PDF — malware analysis report

Static analysis result for SHA-256 257de77cf6bd2699…

MALICIOUS

PDF

87.9 KB Created: 2021-08-20 18:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c5f27cc9878a95ed3ade679a40ebcf3 SHA-1: 2c89df62e068f9e0723c96d5f283b24ebc048111 SHA-256: 257de77cf6bd26992dfc736870c774216134b57e46384b1ddf8e13dc7b1fff75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alrukn.co/userfiles/files/59388800410.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/435eaf6ba1742efa29ebc0753f1ed420/55384318886.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1770fa5f2d---66723640725.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/19112782984.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nimojadodemixibowuguvuze.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/44357515151.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/62300214036.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e75d30e5f---29878600476.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/04io18gukmbbuajbm51jv055g9/nadavux.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/tosaforatiw.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/pizef.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/jr7rp1bb1s33ioefchto3rqvv2/11998238099.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210630_585653009D77814C.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wazimijasoxomobonabot.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161144eb647ad0---pawotosej.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1e13cadd17ae777cb7c546da6e3c4284/mexusopuzorevitapojawev.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7659208e---takefenewuwisufok.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/49e7ff9732a19f4efa0ec7f837140ee8/34382006564.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/kujaxoxaxarexozobufobig.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/60966126907.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/sebolebotupewagemuzesoj.pdfIn PDF document text
    • https://msvadba.ru/files/file/72217519325.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/42519168093.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/piresuluwofalajugo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c479dc41d---kowejunitovetu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/sewerosewijemazagaxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+size+file+does+a+husqvarna+450+rancher+takePDF 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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17508 bytes
SHA-256: 701bfb489b4f9cd557afb5b7da6c0678f39e6bec653ceb4323ac1b2f6ec62f0f
font_01_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13602 11364 bytes
SHA-256: 475ab5ac46373611ef19142d763499f252433d41c2092c3bab13fb3f762335a3

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