Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94d41c121c4fe9f…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 09:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6901ed9ff8da09244086be31b78fe5c4 SHA-1: 60800ff4d88f0656e9beaf44f9072bf9138b7ca5 SHA-256: b94d41c121c4fe9f0fd318fdb732403a59d3c4555c4a2d234166c0af1298c79e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. These links likely serve to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kayamedbursa.com/userfiles/file/93043651007.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864db5c1739---pavolamedapibafaviludu.pdf
    • https://onlinendttraining.net/files/vopadunifobevoforaribas.pdf
    • https://agrilaui.com/userfiles/file/9201482787.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6a429e383e6615151ca5b1051902a1ae/semab.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/joxinatini.pdf
    • http://baobiachau.com/luutru/files/14794159466.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607493205c196---ligevesaxoza.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/warejijed.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087754deff80---7791267201.pdf
    • https://iva-vietnam.com/userfiles/file/foxiwenedumixode.pdf
    • http://aj-logistics.com/stock/userfiles/file/11116620326.pdf
    • http://nuraski.pl/wsg/userfiles/nuderugo.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/djquevnj2fpthm1fd3gpj56c2h/dubuwewomuv.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaa82478af---nomadunikofebaf.pdf
    • http://sanmorales.es/userfiles/files/mewadenegitemuku.pdf
    • http://mobilieroccasion.fr/uploads/file/kofajegevefufibiwejigogop.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210626185028.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ejemplos+de+ensayos+argumentativos+del+covid+19
    • 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_off0000d6fd.bin
b1c734326ddd7b5beed123de6d2c5d74d059e4bf9f49db5e728a08bb2a1348cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 11468 bytes
font_01_sfnt_off0000f1f3.bin
6cd3eefff6c402a299fcf677394c75996dfdac89c52dc81535896d088fea7181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 19296 bytes
font_02_sfnt_off000122ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.