Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7159a54aed6301…

MALICIOUS

PDF

72.3 KB Created: 2021-09-08 10:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2db8cd65b3308c00df8e57215daf4ce4 SHA-1: f33c78c3f57775e673e87a6099fc3bbe603a4c4e SHA-256: 9b7159a54aed6301da90f618015cc05a6fbee1c14e31b557ffdce7c16ff2d8c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The presence of `utm_term` parameters suggests an attempt to track user engagement, common in phishing or spam campaigns. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=irinox+blast+chiller+pdf PDF link annotation
    • http://smartvoicecom.com/userfiles/16783759367.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/83328341776.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070022fa3871---beripoxigopolowetutowomuv.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/76215230886.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3cab86515---92688661273.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ldl1nh2v9gg7p42rv1okneqjio/41155288148.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6235393453---tobujuvoribuvupibemutogod.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1629331114.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/lifojuvugi.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/dazod.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/denezaw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/f5pvqsfa1b1dp6ggbjdnopnfdj/66656758278.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/belenanoweb.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095712f94609---99366649282.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dbce8814---77205906407.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108112025414437.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051811512270554.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/33441152223.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb9805b0f---tefuliwopefisafigata.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/zavuxu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61e497e1c---woniwirujesiru.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e789b786---lijogexizo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cba3587bf---79652670426.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_off0000b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 17872 bytes
SHA-256: 66eb63fae6d25d99ad08c05065c2eeec69532c3039b6627ba37d2a6e6942e681
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10908 bytes
SHA-256: b94d0a47fbf6ffc56476f935d41fcbcb6a2d9007b6a07ff4b449a5071fe748ef

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