Malicious PDF — malware analysis report

Static analysis result for SHA-256 00af39c8b8c32155…

MALICIOUS

PDF

95.7 KB Created: 2021-06-30 21:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9702bb60ee08bb784719b49824e1bb13 SHA-1: bc0cddc08ce534f9e71e96d0de62d92a3fabe6c9 SHA-256: 00af39c8b8c3215590909694853416d977b9b68a3a3710f9a3e1720aa93c6305
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 WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coonvalleycc.com/userfiles/file/betepuba.pdf
    • http://www.europesolidaire.eu/userfiles/files/gubafotutuk.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/351fbaf7071156035188ef1c08982caa/megamu.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0050d191281194c9051de4d19cc12570/56308117698.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160704959ef72f---66001065397.pdf
    • http://cherryontop.pl/upload/fotki/file/46713825367.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe19c9f578---68542169168.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4fbff434c303f161e16b405fb56b1c51/57045753796.pdf
    • https://walkandsmile.com/userfiles/file/lowogakowiraxikef.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeef7255fd---62877353604.pdf
    • https://asiquim.com/ckfinder/userfiles/files/21806326836.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dc4012772---legikemap.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/afiimojrvc6r31m6bb4te9bee6/xozemarexefeb.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d803c49d73aba27a736b50136fcf3791/luwomapubawilemil.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed9cce7e85719d0335ea96733dc1e07e/37492347438.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f91f768aa---buxelojuvidutetane.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1vo41qeaivu6riganrn6c58ib6/xuxaripukodubifulifudebe.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/tamenofumuboxulabemafiwar.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c1c7aede35e4c46e76f339f43df2135c/52719311858.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/56713bfeb729ab103410dcdd353a38c7/72317556647.pdf
    • http://asbu.net/uploads/FCK_files/file/55309774258.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=in+the+shadow+of+a+saint
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc8.bin
1ae0bc0b0f4a558a81dbd36ba6f0830d5a14c09bc6c8276c03a502c80f09dfb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10344 bytes
font_01_sfnt_off0001271e.bin
8e8295d39c22c7ead1cf59c9261a4ddf65bf50c64236d3a86c1436308333fd32
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 19036 bytes
font_02_sfnt_off0001582a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1582A 16792 bytes