Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ee8e21ae5fb7d0…

MALICIOUS

PDF

83.5 KB Created: 2021-08-21 00:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dcf615f13d7d092c3b3e0d349280851 SHA-1: 573a9b9ea274e0e6de5d846368375ea470877e50 SHA-256: c8ee8e21ae5fb7d03cceb730a9738d4c491b78c384ed61fa9909a1bcc3914c99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not fully analyzed here, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cdmatik.com/uploads/file/womitoxunapusawiso.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4lerikehivt4snglt5l06j3glm/bafitananupeb.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/xulijutam.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d1d6b180f0---begosulomadim.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad03a809f---41326149600.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823632d3615---5321417751.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o5j07unnoj4unqvnbas1phjgbf/61651669657.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3e0b843993792df411614386c6e1fd0c/79883899393.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8f4a1698d27b434336e68e010971504a/20925404956.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/31733439846.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/joduwitadukizetux.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/75599706387.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5171eda8e3f83c32b6ca8a5aac32aa03/99658687045.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/nijuvubakawepo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/41416218645.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3e22e3ba---42254611785.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/44525845876.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fosaxutufojugepuzefep.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8b16e29da74c28a25e55a5c30675669a/8850607296.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/54555033953.pdfIn PDF document text
    • https://lemanssrl.it/file/wuvowovimububuwabekepovos.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210608124216.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/h8agkn4q63if7hk7rrmp55fg15/41868960020.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/80920936926.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8858217d4ebf3bace4f678240297fd65/jizidoruvepazevuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=momentum+and+impulse+worksheet+solutionsPDF 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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 17316 bytes
SHA-256: ac178a7e658b6507729b9262e419c45926c122cc35daba57a99a9b43b0415ed2
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 10928 bytes
SHA-256: 580f96b36a8274d26e1b6f57283d2a18af52d693d2fdab3bdb6212e10da75e80

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