Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1bbef75d18f5c8…

MALICIOUS

PDF

101.4 KB Created: 2021-07-05 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f8919c6bd2f64f0fb900fef29b702c3 SHA-1: 8a5740cc2edb8c636f1e9b7e587e4e875224a254 SHA-256: fd1bbef75d18f5c8371fab04bda43d2cd59efa82ba34037991f6231492ee0f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution vector for further malware. No scripts were extracted, but the PDF structure itself facilitates malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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=real+steel+watch+online+english+subtitles PDF link annotation
    • http://adabaskimerkezi.com/upload/file/41890168359.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kexivan.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/bizugubedipepabew.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/296098fff33af3c6ebc591d02c58f2e1/vonovotemebumaduwibez.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/15452904042.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/tagefubakil.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5d8614d2---tadunoxafamigetusugasum.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6884f0b31315d51152e3e84d95959f87/53091555742.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/lekov.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bb1d913010f97ba5a27d662788eda8db/lepega.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/533c373604690ddbd49e0b32766977ef/pemavamobafakifobaf.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/niwek.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/dogusuroduwidomi.pdfIn PDF document text
    • http://dalaichau.com/files/1136350781.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wukanebaso.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce8decaaf---dorabinakitate.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kurazatujivot.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e2cjq1arl2tv2eehm68oto92i3/zudijafogudejip.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b3d1baeff06a755b0058fed886b2c11c/93789243024.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f24f2b78b---40717176368.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a5bec691f06a70570f65d632fdb68633/74852386562.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06c49ad14---gogezot.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/gamezusometo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa950a95931---tomegijukoge.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_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 17776 bytes
SHA-256: 1e0e155c7ad6e9385a22ce07552bbbb7d07957b42bfde2ed91fa71c8d5d43421
font_02_sfnt_off00016f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4C 10780 bytes
SHA-256: 01d120d592f8ba505c22c0a52c8497468e3012f902d03d82671e7aa470f66620