Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5cd7cd5483b932…

MALICIOUS

PDF

66.1 KB Created: 2021-06-09 05:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c381acf9c92cd69ebf6ddb7c1c1c6722 SHA-1: 09025f6096491c4f3a70b51e35fab2dd1ded32a6 SHA-256: 7a5cd7cd5483b93272e0e39da3e4ed5d5b4acd24ae9bf390df7c8f58ad1feed6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=converting+particles+to+moles', are likely used 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://inwebjor.ru/uplcv?utm_term=converting+particles+to+moles PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940648490a---vuxazufumowobijom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe73d0b135---raduranaxideposabu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2vfco9co17rlljrngba105ui1/beluzidatawujo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab7a25fec---gezisekaz.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gekrf3nb537sqas4e61v6dhhj3/kedopapepukefe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/354354e8e3c87d7e08e79b09846c84f6/24624761684.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/mumonagupoj.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/10550420427.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/40d4b29a2a00810a14b228b6f53a7484/kugalujumewa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/40324890464.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d011b7a0---rabawolorozelejizezakov.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f7d730f6d0e9a3e0702e68432474cbff/33173592175.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/rasexafow.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c8eeb67f---18739704004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA1 5124 bytes
SHA-256: a49041029337811aae46938eac2436585cf590a904d2e849e03dd0ded2b09beb
font_01_sfnt_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 9036 bytes
SHA-256: 56c73168322025bd9cdfffc7d5fc6014a3a39746036bb608e26fda64ad38b89a
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3