Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb29f4bf53cf837…

MALICIOUS

PDF

74.5 KB Created: 2021-05-30 06:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 08b586a5b3574378751a4431296fe574 SHA-1: fce6a258f17db5cba85bbe7ae0f7ab6f5bc4ac3c SHA-256: dbb29f4bf53cf837c490e349e33c2a08cc957cc4fbbac671b568b0fdb4f338c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect users to malicious content.

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://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75288eea9e---65815505991.pdf In PDF document text
    • https://mollis.rs//files/76710017777.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1f9c40605bb614a207a36a567dbaa078/jususo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6418a293---3935949020.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sr610o7b3itjdmohl2379rou1k/lakabimetuwepupobomal.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160907e696575c---kegexojugodoboparofux.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b99688127---69906784388.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae507b614---82643776070.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2b4b06aa---gixikitarir.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/12745469988.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/70595100191.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xerifesilut.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bitepalixipezaluz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d5dstf84qj5tmm5de5oons78hv/lelukimina.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6bb573c56cb71c5c9584a5aa2950383/zunegofarelopojex.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/mivuxuti.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ea039a940605207939b7a95df4a4bb5e/wazawosopokevubomaxazud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=danielle+steel+best+books+listPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 4784 bytes
SHA-256: 5c636bd75b852e64cfbaf327b5ae6b613431056181021a84899ae3d99f5a13d6
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 10440 bytes
SHA-256: ee4ad91a3f891bcad31564195a4b163d39a8a83de45486cd767eb52c182d214a