Malicious PDF — malware analysis report

Static analysis result for SHA-256 977008dbdc44ae5e…

MALICIOUS

PDF

94.0 KB Created: 2021-06-10 02:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e6eaf6b92bda341ba69a93474212f53 SHA-1: 5f0914f230585d6640376f67d22ccc7ce668ee77 SHA-256: 977008dbdc44ae5edcc8426281915f020f59c3bee8ba0c62f220e9f513148daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised websites, many of which host PDF files via vulnerable WordPress plugins, suggesting a link farm designed to distribute malware. The primary lure appears to be software downloads, as indicated by the URL parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=king+of+fighter+97+mod+apk+download
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c30ab212---41881972080.pdf
    • http://vimbark.sk/editor_uploads/files/zagufilagelapuposavojezi.pdf
    • https://aonetreks.com/uploads/file/xuzodifetodagitag.pdf
    • https://planet-for-events.de/userfiles/file/dabaletawetanomosepide.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a276d7c9af6---raviwajalabinowinula.pdf
    • http://fogathajtohirek.hu/fckfiles/file/ganidabise.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5be9983d---defeluvej.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ad112b42---sumetup.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b606b551ff2---23146990827.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/vf6lpgllrmca96v55lm2163sgr/38598480832.pdf
    • http://henri-ruch.ch/doc_pub/file/812519830.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab832c162d8---zatobudewogabivero.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735aef90303---45659672502.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8riulophe7l4d9c85i59d6d5k1/73787444692.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/15cddca7a2ce3cabd7508a52c24e3452/pizovewa.pdf
    • http://davidlbrooks.com/clients/868292/File/disuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000135d5.bin
14a96f6dc1eb800344168bd278fcb5090141d8c3927eb7d71a4e33249f9601be		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135D5 29856 bytes
font_00_sfnt_off0000fbbe.bin
3aba347db316e2380ebf290111f44b8b2023debdd3f002ed8b8bb0958079ab38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 5636 bytes
font_01_sfnt_off00010ee9.bin
e2616e853556be7605e6f00487ab967dc66d32d282accdbb2d1cc5f02e28975d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 11576 bytes

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