Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95e1145e2186c5b…

MALICIOUS

PDF

72.5 KB Created: 2021-06-22 10:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97babf10798e65f4f67a6c0e1f778692 SHA-1: 1b119cac68cbced85dc7e1d2bfae0311551b71e4 SHA-256: d95e1145e2186c5bfa007087033c2d8a21178a4e630b08c9c9dae4a94f03024c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'birds of prey online putlocker', suggesting a lure for pirated content, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea16f0c5bc---zarikezemomasesuvur.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae1555b36---6263110210.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/3659940197039ec9490da2011c31ce6f/joxupifamunakafeki.pdf
    • http://udmvdpo.ru/images/files/8366072807.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721306203fe---31278749739.pdf
    • http://sns.hu/_user/file/68209498112.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99e9cdfc2---88498179814.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-5/20210605215135138597.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5b858500---litij.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3dee6511a---64014604424.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p9t48kn2vfht0samiqlge5k53/zebaxikamarokoxotikaso.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/gefumubegefisewux.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/404f6b2bc77423550967b67d2f5b080f/72744136255.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/tdjvpdkgtepv76ntnouf4fmlj1/wobewidakirugi.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6lt64r1rc5pp531rmb30qeft2i/15858098204.pdf
    • https://virtualpulse.eu/UserFiles/file/81737529326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=birds+of+prey+online+putlocker
    • 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_off0000d9dd.bin
6e48b524795bea464ca84ce39d9e5867ae39829460ff6ef5783eb78af73e4609		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5152 bytes
font_01_sfnt_off0000eb88.bin
6457344abb7a26a29a07c2f3b1e4b0f75cea14df370ab08991114a0e44bf9a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 12584 bytes

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