Malicious PDF — malware analysis report

Static analysis result for SHA-256 4354323eb367a2a0…

MALICIOUS

PDF

111.1 KB Created: 2021-07-03 22:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 107f98cdde0e223c1cb444e58dfc1930 SHA-1: cf835eea7cfc2c083112a75dda1908f6f050c272 SHA-256: 4354323eb367a2a0b895d7fccefb9ca349d3077a2272a94f8f3299554fcf3bfa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple URLs hosted on compromised CMS upload directories, likely to host further malicious content or phishing pages. The presence of numerous links on disposable or compromised hosting indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/cba26ebc4a01bad85df679999e13f5f7/27607399455.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qbl3089a1sne2f56u9h02adtqh/bilizikenala.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/mutonidakagebiwisokederus.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/voxivabome.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7091804200.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a8d212d6---vuroxewoxexonetenesejaw.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/sedimoxadarozazedogonevum.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/le9uo2n5n8hpfa086vjlb5rkgh/71127701638.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/54766931190.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9dcf03a603cccc99d9074b9c8de72008/mojob.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tafokevuwigotudetepute.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cffc5uu07e79cb76uqofmta0f6/32289287978.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/mofofa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0dea62081c1668327c45401b3b7be602/wetivawep.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160975ced89de8---45592884947.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fevoxabusizinewapivesipi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52f9b2e37f3f3061bbafdb89d621b4a1/belugizos.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7ea6d97674501100b0a41ebc9b66954f/11215266717.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/jozij.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/lamopapupisusaxe.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6193750603.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u91om9drtsb5e7mms5fbte2s63/boduzolinatuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=disaster+management+policy+2009PDF 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_off00014fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E9 17204 bytes
SHA-256: ffd0e48c0a1643e630ed9a33e315008c52d9c68605b55a8fa28b076ff90c063d
font_02_sfnt_off00019502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19502 11244 bytes
SHA-256: 0548e3645db0513e5f862e36df2362a57d220660650a6b7e28046cb56e74ba62

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