Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a70ac274bc85fc9…

MALICIOUS

PDF

88.9 KB Created: 2021-07-17 04:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84ff5493e605d0ecec240b47e43a9df3 SHA-1: 79b26eab9c065e792670134c00f998fbfda68ffb SHA-256: 8a70ac274bc85fc96edb43f4acd69d1fbdc14de56fd11a099559ecf730562c08
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 a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0265d39715e6930f9b79420e09cd13d5/jusato.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb2951fb2f---femagulusiloj.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/66873233756.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b028f1d66c0929a230141a7a04c49f4e/57711144128.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/143994e99c181e31aefdede2928534e2/sozizutawiloziligutor.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/9126334957.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883b0063c5---zabeta.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/486b336c44f797dfda4335d84ebb5c25/doxaxagunake.pdf
    • http://alfavit.tv/userfiles/file/pomeboragufoje.pdf
    • http://zrdb-drogbud.pl/Upload/file/finazopinigivuxabi.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f964acab42725d2cb462a26e3b2ccc47/loxibelakegu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609324be9fd1a---6755315591.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/07aa0cfa599c9c5cdad6c0f6c8f25042/litenakigaxu.pdf
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/15988321697.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762a72f27bc---lotutarisetufilo.pdf
    • http://ahcxdq.com/uploads/file/291831599358.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/748597e5aa63735a2739fd0e7684aa07/vutezuramajasubisewutu.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2l4fe4vbnce9j7e9p4mi4m9q3v/79076781321.pdf
    • https://amursvoidom.ru/media/files/boposuwunitinurifos.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd65144fd5---bonidejaxabusuwepo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088b58a29eea---59193282762.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1584dcec1---79948485249.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aphorisms+on+love+and+hate+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 16792 bytes
font_01_sfnt_off000110bb.bin
2b06002a5ffef0202bee99cc2aa3d0186b66adc17154772b928e6acb5aa010cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x110BB 17024 bytes
font_02_sfnt_off00013d5b.bin
b0a0fff7869cd3db2aaedec740fea1e2d04778c4b9db265c158d3833844a65e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 10812 bytes