Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f911df3c800414…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 04:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f9c8fc7f4fe02419171bad65edf1014 SHA-1: 5fc8a5a0e3d2cc7b15db4f69dd916f6de4957cfc SHA-256: 82f911df3c80041457d8d44a9451e4640ab69e45a2485b742085f9ac7292af5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://elitvorota.ru/f/file/lokudomisatekekezaxu.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/d4mm4nq3rfq17htp34aa539keq/94581313818.pdf
    • http://bwc.lt/i/36015825134.pdf
    • http://progfin.pl/userfiles/file/69795931047.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3341b7412---sivabovibafimutuful.pdf
    • https://altaspin.com/calisma2/files/uploads/66601990631.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7e16b165---5593632301.pdf
    • http://dakmet.pl/upload/89577732036.pdf
    • https://ka-base.no/images_content/file/tafumoxuna.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160814b810503f---redapejefitawato.pdf
    • http://planbmedia.hufiles/vokozepuzu.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v43cfp0juk985sh2csa58tcqmh/mewugofelabu.pdf
    • http://consulcongress.it/uploads/assets/file/kakuwawa.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/86949086799.pdf
    • http://zulassung4you.de/bilder/file/51770470091.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92570b0f03---87840623237.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+meaning+of+sum+in+math
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin
7bf08b256e5a9179ac00f5b95ca24c1af25aa6baf6abcb6f335ed63f6cb462a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 18292 bytes
font_01_sfnt_off00010370.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 16792 bytes
font_02_sfnt_off00011b87.bin
5a14c809aaade542895e0d84cd411e5f55b56881033d49d5580545384f632259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10608 bytes

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