Malicious PDF — malware analysis report

Static analysis result for SHA-256 574abb16e7b25570…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 22:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a24876207f254ea8867ae367f5a70286 SHA-1: 99e4b59a9226f328331a726245f7bb4f7021e93d SHA-256: 574abb16e7b25570cfefbdc32e06a81e688821e034d7a2d13598eafe2b3b83fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The presence of multiple links pointing to potentially compromised WordPress uploads and disposable hosting suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://vivaibonomo.it/userfiles/files/81441789090.pdf In PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/fosurorog.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/7386972579.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/degiwekigetojujaxoduron.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/wuvoz.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/31524121694.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/ranumipefimukerememive.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0bc0212d1---27005822451.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/dumedadel.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/nutadozamozisilijirum.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/26011470330.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0a1e3786dea141a9fb4de406459ba83e/92137567006.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/roneguvodaworigi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4fd8e533d5f3cf54505d8e6eb881b245/567571010.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f61756b93---munobogubazoxuj.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6b3ffac4a2a52ffc9aad08bcf5c6e2fc/gibibukojogefeg.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5e6d85bf3---4268731975.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/sibolujivovoga.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210528022741.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf8272da3---27822475924.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8um3f2e9e6lrh12rtaaf2usa03/fogibakefasadaze.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3b821e2a6b354b383d7374843b423314/80727175834.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/30209639426.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3ff02108dd1e844f146a413a055f3b15/47302740607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+combine+multiple+pdf+files+into+one+single+filePDF 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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 11016 bytes
SHA-256: fda9292752dea51a588013355acc9e016160f8148fe484ffd49be42cafe36e96
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 17136 bytes
SHA-256: af4529114e75e61186f24f5e4fa471ff46686396f940f4f81c605e1409db7972
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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