Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8aa5a7f9729c96…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d4c218360ffc300a0035cdbed9f6b3e SHA-1: 4a5dfc9991290bed88f2844eb160dcde12c99c53 SHA-256: ad8aa5a7f9729c96fc2bcb29e7625be193045aa1f7aaab77e7dadcff5a88d271
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These sites host further PDF documents, suggesting a multi-stage attack where this initial document serves to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9ac77f965f83a53ba828e43598c7bffc/xitigovopela.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/rigamuk.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf95f1fa0d---forafiwujarafedejugus.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/70618443428.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4dcbef7fb8a2c53da3086eee270b6065/dogovisalobejujuxafik.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608597154153e---demezaroseb.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9802134fe---vawumisajerudezafebu.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/sarun.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728d61934e5---girorupikixomokafoxavonu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/39741278832.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///96897473905.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3b5b6069---rimumumadakozitigumilazol.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/fdda6011147d1d246ea9a09e3024197d/vijisawemutumatoz.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/pubavokujivepolaposetujo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d110f1edacb77842a067b16ce0d326a0/9893927211.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/38549001832.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ja90vusg0vqnfhklmbt0t8db9o/benagutoxiwekozazanub.pdfIn PDF document text
    • http://uhorder.com/upload/files/pijetuvalokipikopuvuz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c211c1a83---31548181767.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c0f5e7a933a457f519609d4146d39ca/10093966070.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uoictfcmnp35n2a363oo57uegu/faxeje.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/85434820515.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/92814206825.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/36710224380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anxiolytics+drugs+pdfPDF 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 19292 bytes
SHA-256: 7ed1284a56bbcf7040588d8048b9b13e21b9514f65813f207096750403893735
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12847 10800 bytes
SHA-256: cd98e934086a5ebf10bbc7fb5182fbc8fb9c0a6fb4259522e44970f4ea5aa701

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