Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3fe7309e61c296…

MALICIOUS

PDF

79.7 KB Created: 2021-10-08 06:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b3d734a4f67d13ac89d3206a290d0475 SHA-1: 4f7ce8e1100595d67044730668c2a9224625c838 SHA-256: 3c3fe7309e61c2968052551b44337e43b89b0f4b1ca604c7738d76e7b42bf389
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this infrastructure, designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ministryofrum.com/memlogos/file/teralawapasuvajovofumoj.pdf In PDF document text
    • https://mar3ol.com/Files/files/timikipid.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b3e8f5b587---24284831834.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/64623167035.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/60872004947.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/44246627216.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/61947345835.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/74483045647.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/548f5e137739b82a815f1ad41ca08de0/jiramuwekesigoxuw.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/66369707706.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lokurabalog.pdfIn PDF document text
    • https://premium-house.uz/images/file/88805811201.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/60801162013.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/lopokowesixusixinon.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133fbc086af4---1291007850.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615733e63f4c0---69123639857.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/lakinib.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/45323782661.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/37811926049.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/livudamavudekozekosuzites.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/27821391800.pdfIn PDF document text
    • https://demowz.reikor.com/webimages/files/fixiwig.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440fca1ff4b---33444093306.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/35609345585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=text+adventure+game+javaPDF 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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 18580 bytes
SHA-256: 73fe3c0819e28f31c6e118e942a99f032745a2efb18ca6e9db366e97ac89cc01
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 10524 bytes
SHA-256: 71a68a6f16dac13d921b13db0252ed9e787017f06b60b33a0bb4a0e0004312af

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