Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7599e70958bcb8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 09:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd42edf5efa9424dc8786faca7c7b4fa SHA-1: b2ae1ebd8019e232c8e43a071fe9be4311a4fd47 SHA-256: ea7599e70958bcb8334ee12f66121523ac049368d1f9782b95a7aa0875c30730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit users via malicious links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=email+body+for+sending+resume PDF link annotation
    • http://garderoba.sk/images/_file/wogojisogitelepebapadaxo.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091010101983.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/73381859840.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/73295165047.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/30054336588.pdfIn PDF document text
    • http://planbmedia.hu/files/14839506589.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/79126580070.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/vimabozatofi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/pivavobulemisop.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/23566580032.pdfIn PDF document text
    • http://telecycling.org/files/file/5400150931.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rerafudoro.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/62522325213.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b94280a7d---xufufapababefadedolol.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/38924873618.pdfIn PDF document text
    • https://atlantidegattico.it/file/30874879859.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/5078665693.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0eed9a71---41130461364.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/98921011191.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lelafupopimekofizuso.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jixofiwezazupod.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fefe0cd2f2---58690200195.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/73798047198.pdfIn PDF document text
    • http://vhshf.de/File/79412503830.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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 17964 bytes
SHA-256: 2fe5d902f341983ba33c7f8bf8a359a467ecc53064aa2ef8eb0b54522e0a4b6e
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 10936 bytes
SHA-256: 885871e78fdd1170c87240dee995d82e38ac6862ec8ffe2dd07f845b6921ce3c

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