Malicious PDF — malware analysis report

Static analysis result for SHA-256 466822c13cffd27f…

MALICIOUS

PDF

96.6 KB Created: 2021-06-29 01:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2158ad8cabcd6e11de533ab6c11e4e33 SHA-1: 45372407f6f5ae6cf0323bed1a2b6a47cd78f77e SHA-256: 466822c13cffd27f13d148490730dce5046505ad4cd1f24f0319104e00bd7e5a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://quatang3t.com/upload/files/riboxifinuzelov.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/41655402727.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/575ba9a49f28b29ef7ea37787b97218b/41960208432.pdf
    • http://brette-animation.com/userfiles/file/94051220330.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072006704b0f---76441850321.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03695b6d77---15886416076.pdf
    • http://jrmhandling.nl/upload/file/75131040338.pdf
    • http://sjhrz.com/images/upload/File/fibunenoseti.pdf
    • http://bakoca.hu/files/file/72190643670.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078403eebcb9---vurugijidigoxiwi.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/36e9e1d83c642e063dd029fce649594a/zawobofot.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06f053467---35646319683.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a523971ce77---judizilunorisar.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2vonnlou17ljoi89756uutvkjv/dajinufusesoj.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2ac9e65---kajatirokur.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/lveece6l890h2o4l4285eb1596/zelisi.pdf
    • https://arrayamed.com/userfiles/file/51857529951.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/44322323030.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873ae8b05a---95045949200.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089321372c88---kegoxoxesunitubofadikukon.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f08a007f---lunavapereranulululozopi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac315956394---29804529534.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/es4p25lv856i1e02ebd5i86ksu/motidanuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=corrupted+item+path+of+exile
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010289.bin
e77db149dac2a64176dac608c2ce126617b37e56283f24aace2eef3c6a9257ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 10724 bytes
font_01_sfnt_off00011b31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 16792 bytes
font_02_sfnt_off00013343.bin
66cf7012a9980f872aa083a718d98b9b68810ca674c62a5d3e75496023cb5bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13343 16892 bytes
font_03_sfnt_off00015f4f.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4F 16140 bytes

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