Malicious PDF — malware analysis report

Static analysis result for SHA-256 724ebbf093bc415d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-18 01:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e74846a2b19921b34d39b95767bf1ec SHA-1: 249d5badd77518ab271798f8a98dc16d9f1e2acc SHA-256: 724ebbf093bc415d56ec59525f711bd5e8794f0dc6e344f1d5a2c6b166e74334
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious payload or exploit. The file's structure as a link farm on disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/030db10644731c616ca5c4560d7a1945/5041157508.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b4d3c9d105adbbfcfeb5e61cae139c93/93965326655.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a692bea070abf93916359f3849e20f78/bodevupafosoxujitigigabot.pdfIn PDF document text
    • https://2acontractor.it/images/file/33482862772.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/tumisemonivozujudosap.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/11609199068.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/96690850770.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6bk3fcthenrb84r846f0mhq4n0/mepawizorumerig.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tts419fq6smu3nubp40e81huo6/xonelunizuvetob.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/28777596881.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eb40612d9---gunorufivefareraxubu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160809d273f49c---tononizoderonipejifuxudo.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kujubibakekezu.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/midujutukijop.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/32e889e6431669a55d7302fcf49492f1/fasebifazapusigi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e4c05b33---53131091283.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/k3plmdmdnk266c7insmes868nm/xabor.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/zizapeguxiditut.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/69801156956.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/12177327252.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/97ao0e9526rcqt0u8mr9q86gg6/21650523179.pdfIn PDF document text
    • http://industrialdevices.in/uploads/59361827323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=icarly+one+direction+episodioPDF link annotation
    • 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 20532 bytes
SHA-256: 041028c86a103a6aedef3d10d0278b723275907201ab3e33adcdc4a55d74bc1d
font_01_sfnt_off000123d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 10572 bytes
SHA-256: bd672295ac88ea085438314f41cd6215fe825a4e04d0043da2ba88f71af4d443
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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