Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a25510aecd2a2d7…

MALICIOUS

PDF

70.4 KB Created: 2021-05-03 18:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fff9dce1aae135f9d1e85cbe5dd9d62 SHA-1: ef3eb362a3e1bf13951a33067211cc5a0cca799d SHA-256: 6a25510aecd2a2d76e878a50d43b651c709edf0b5442bf00e1ce7ac9ca9df25e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to redirect users to various websites, some of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to a 'video audio cutter app free'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5348938b152559c7714ee556f9ad4505/69967477458.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4cf9f022---9658638947.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dece98c254---78630486672.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5efd4aa69---jojodozijujonalexes.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb20f0fafb---geguvevomuwixo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904cfa6c30---99438718333.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701e74a0852---waleg.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6df0377---18695741188.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071984583806---sarevunap.pdf
    • https://airbays.com/userfiles/file/73272679804.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896854b26aa---namorugoligazozuji.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297e3165a4---zakalumukipu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ef3942ec---38733076760.pdf
    • http://adamlegal.com/userfiles/file/banejesinilifaz.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/hrtfbkivae631d7lc0h97l908d/92816807843.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e61dc4b1---temegezozuxavogujifazam.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c11ccc15119097ab5d8b199a2cef693a/bodizoxemijoxunexus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=video+audio+cutter+app+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c9.bin
b76bd960c6321424b16d833b6f0f958cf6b26e33fcebde65d6a4065fee870731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 4904 bytes
font_01_sfnt_off0000e88f.bin
b6982f7bd06a9a043034137db8630cd537f0cf669fbf6a1c665867d9e52eca7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 10660 bytes

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