Malicious PDF — malware analysis report

Static analysis result for SHA-256 723fe94128a52331…

MALICIOUS

PDF

71.7 KB Created: 2021-06-24 22:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b5b53ccae1b1a669b67f466832015f SHA-1: 77dbe6b3de59a24d5d0b1afa67029c65bf3c2bc6 SHA-256: 723fe94128a52331037a493a756837841ab789fb33781987b9ebba05ad1b7465
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to various compromised websites, likely intended to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of numerous external URIs suggests a phishing or redirection attack.

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 https://drafthe.ru/uplcv?utm_term=gk+pdf+file
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/bokole.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c681eb331---nasarepalemej.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8b419cb9---66689742334.pdf
    • https://agronlogistics.com/userfiles/files/25388804374.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jmtceefu8cja05cs5149shd92c/talokifixomusipiluvomir.pdf
    • https://vongtaytramhuong.vn/upload/files/mamakesewamev.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/44a95c48b8ba19a33a53351f316b649f/gilozojidaxifuposuresim.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a1e31e888adaac3eeb927854a8245159/ludowon.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf1af392e---23544790328.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6508c9102---92884147406.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faral.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef314a526a---sugabuzowepam.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b62e526bae1716d22b473b74fe23537e/50033494240.pdf
    • http://adamlegal.com/userfiles/file/82584583388.pdf
    • http://zge-led.com/luodan/images/userfiles/file/zabikegewevusorexejitozo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf7.bin
99240853f40046c839b63a24a67d5bcf21c858f5b28fc4d870960c0208de5f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 4644 bytes
font_01_sfnt_off0000ebe7.bin
2a8ee88cc0a23317d12e51564695a41eef4612141401b147788cdad71cdda690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 11276 bytes

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