Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4a8db410ad4292…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 23:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 216ee29b941d00fe4a434faae365640a SHA-1: 817994c7981012e0d008d0475d3e0b27a0642bc9 SHA-256: 9b4a8db410ad4292c5ce866613477c71bcf36027a1a646f456e4288172b8c629
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 as malicious, including ClamAV detection as a phishing trojan and ML classification. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=michael+pena+lincoln+lawyer PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160814223625b8---wolapatu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d096aee3f---16659239882.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/18064473277.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570ac1082f---51540708636.pdfIn PDF document text
    • http://fullx.net/files/72421549872.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/63930247019.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/256cfbc497ee5f2df0601ee3428086f3/85457382117.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/suwubere.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/2748334327.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16102899d25be2---dajumu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/97984042970.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m9ueh4vdoumd9keiki9upggvff/59577981076.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f968cf9dedaac14b04000b66d9162ffb/numudumexukenukaz.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/30995035774.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/21141528980.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/39743425914.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/fejoxafikiwajaruj.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/49240609167.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0086a87f5---vepesul.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ef5673d3---kuzivibuwaware.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a542473abf0df8239116cd0f9759b708/27530074539.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/kidolepi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f525aa141f---vegazafo.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_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 20684 bytes
SHA-256: 425727cb898824fc6526d8b529d55a978550752b2ce7a41c0d94d7beda9d22ad
font_02_sfnt_off000152a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A2 10396 bytes
SHA-256: dc59d3154483ac9a47c494d8e7ca3748f98704151a504da42bb1d21d71965b95

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