Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb923b8418ae166…

MALICIOUS

PDF

73.4 KB Created: 2021-07-08 22:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76e1c14f7dc20c61e224134b2392d4e1 SHA-1: 4c7c413e9ad7069ecfc73745e172992d21016e19 SHA-256: 3eb923b8418ae166331f581fcc6f51e61ae35ffd4d403d267b01a1058b129dfc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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=synonyms+for+clear PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc33b32684---62644446084.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e5f86690fb3aaa06232c1aa5791a7a8/pumuburozokekiduwozotul.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4gtbeb6493eaub2q1ggnoklsvm/xapefuxi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/76f06f42d4ba32e1f2a2282e0184eedb/zuvukugajejetavinagavu.pdfIn PDF document text
    • http://guowangcable.com/d/files/ripomafugupenif.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9e01ccd17f---60545526960.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff49792be---zujobikafugejepu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/m10b3gkee6l5uila4dopdul8ps/lojadepegidoxod.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1048eb4321a2385101503fd80f41f54c/88085913923.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33636051d38c16e4732b5d23930bea7a/83105807772.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/19fd4ad67c94c8933a50690ed9f0d20b/potunuwatajupifoputubom.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/96729712600.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/8302280835.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/renajexo.pdfIn PDF document text
    • https://appfacile.it/file/94898633837.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/55749807815.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9a30f338146cfb99cdfd49586afac44a/73175658058.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff1c79524---bepitani.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/17294706611.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/suvomizelalorawife.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b79d0e10f---gulabuz.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/25ceca7a017148c7c7b1250426d62e4c/zopaxumukolurid.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcb1be845---40507371640.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842f9a9352---68859351124.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4a2440e6990dae0da7a5ce408faf01cd/jovobafalazanek.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b0ec9063---67259630629.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e136e399d6c---38931527235.pdfIn PDF document text
    • 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_off0000be20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 10496 bytes
SHA-256: 421250658c052d6d44bc42b117b66e958b06da98db85682f395d48bb01ba1303
font_02_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 16392 bytes
SHA-256: eacc43c45829d6c749dd5c3998ce3596dd9e882907a32e8393f9267a18258d9c

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