Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6b7529b285f8ab…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 08:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4606c04b532f1998da89acb4f6243fef SHA-1: a853057444c4a7d4474686e896bbc8642566b116 SHA-256: ab6b7529b285f8abfaa2bf827c99636cb051e18ae90b1f6a3caba98aa58b86f6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on disposable or potentially malicious domains. The presence of multiple external URIs and link farm indicators suggests the primary goal is to redirect users to malicious content, likely for phishing or further malware delivery.

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://pixomot.ru/uplcv?utm_term=manual+information+system+examples PDF link annotation
    • http://volkshilfe-ktn.at/images/content/files/ratumufozegunuzu.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/42656257765.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/xoredakalakuxugelaxemajub.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/balusipunotumigefesonom.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/lupelomi.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bijuwogukaziminamonoba.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/wofozixigadelaf.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0f73k7cpf4gc1nndikcp5gjvr7/70427321941.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/24378390289.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/56621017574.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/kakexomimawagetugokolo.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/77965728991.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/bepobu.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/34493095694.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3863aca59c4d30b5fe2e2659e2c36814/37186260247.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/85071917709.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28d318d7a4---75290693962.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7a261df6---10405610954.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/vaduginakelolomar.pdfIn PDF document text
    • http://tahyuh.com/uploads//files/202108130100028272.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/40693769351.pdfIn PDF document text
    • http://jp-cable.com/d/files/84973224512.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0972185db---85278757542.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/81635550030.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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 10828 bytes
SHA-256: 41d11342064c91c90298541682c8d63250491619561a1b99765d94b8acd66433
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 17328 bytes
SHA-256: 19f5327a3bad4b7697fb5056acc541deb963a6a37d19ca45b6a58382fe4746c7

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