Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb350b7c60a68bf7…

MALICIOUS

PDF

97.5 KB Created: 2021-07-29 22:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da871ce3bebb2b98184ea73e4f3c4cb0 SHA-1: 31fc5d656bd0ef4549f109b84a042ebb5864bfcc SHA-256: eb350b7c60a68bf77cca0b276726f03f583788a433f9f4e2c4880e8b64f457d1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cb7911f55---68472993847.pdf In PDF document text
    • http://captaincook.hu/userfiles/file/riferisazofajode.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/nukuxezijewasezi.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/895912712.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a252e039f16---golakububunebime.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31826f4095---kasegubizu.pdfIn PDF document text
    • http://casaalu.com/luutru/files/supikonizegesibunekawofi.pdfIn PDF document text
    • http://berbun.com/user_img/file/biwibakoneg.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/81347160820.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mabitorusonujipibogovuban.pdfIn PDF document text
    • http://goref.ru/files/file/30200471264.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e62b742f5---70419839542.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/27478819084.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210620210124.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/vaxuragokevewirumoxoped.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/7794255217.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b1321941---katonawewo.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/52376624966.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8da5d523---16576149571.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215121738158364.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e6ba9cc9---77892639335.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/rexepoluvavaveluluji.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/71169909199.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/44339067942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+adjust+stihl+fs+45+carbPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302F 10996 bytes
SHA-256: 2198d2869ca01154672e4731a51f412ce72149c17fff7d05fd552b8329a72970
font_02_sfnt_off000149eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EB 17224 bytes
SHA-256: f6c4166084e7dfc0bc447af194568848e4a19a20ffb37d280df1c3ef57569d3c

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