Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29517b19297f505…

MALICIOUS

PDF

94.0 KB Created: 2021-08-28 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4a96cb47c8998c5b6a176ff724dd852 SHA-1: 66fa06cf1f3acc820c8bf4075105de0a47b22938 SHA-256: b29517b19297f505b17c5e010d4df3016f756a49de30378edc9076ac5f567279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/uplcv?utm_term=1+year+diploma+courses+after+12th PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3e0bee7e64e7f66ae8d2b044d15f2e67/65246650542.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/45269835333.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/xodagijuw.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6890af8d62cb21dae12361cd0f04f5c5/51647648807.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/jipasoribemubi.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/95044580983.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/48434295649.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/daluwuz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1c8716ff0a3cd56ddec94e92bc3a304e/96719115607.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/59931322670.pdfIn PDF document text
    • http://healthywithhart.com/res/file/9584229671.pdfIn PDF document text
    • http://vln.nl/files/file/bepagexi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/00851a410ac9e52de31cc7bff2a86c95/27961536610.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ae5657ac---77810052803.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kejaruteromewez.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xizuragoretajanorere.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/gewoj.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e70b77df1d8cd3b55b3468cf9e788403/56765801601.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608104e275a83---5059528182.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/82258556038.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612171a936e65---97629740004.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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 11072 bytes
SHA-256: 0aa978bf001c562cae74880f09c45f3b0510cfbc28cb97f8ef24aa9cba8430bc
font_01_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 18832 bytes
SHA-256: 583ed49fe61e958eb5d3793036b8c3290364b4092444eafbfb4b339a09faf982
font_02_sfnt_off0001503b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1