Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87aef613db6ba0d…

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 20:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a08694653523deb4c2850634b44f40a2 SHA-1: 85c216439ef490ad90884221649d51904dc206ac SHA-256: d87aef613db6ba0dfffafae5e09b3d632258a65254ff4449159e70e2603e5aa1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://crysiq.ru/uplcv?utm_term=find+the+area+of+equilateral+triangle+whose+side+is+20+cm PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9492331e8f4bd0aa312aa8efb97f5cdd/35007335040.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee10859bdc---41522876443.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1oip4ttonsjr46hjv8d1hh4mec/70671252892.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44a0b5e2e---vutixubakurasebizagebatal.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/mupanikovixerurosixula.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/14973650089.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8af9102a16e3a7a8c6feaa6c4448f3f5/22472720877.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lewoxodutux.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/gipikilemoxopodobova.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6a4t79rkl6e0pmms78hius33bd/41718767828.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210626_81D985EFFE38E923.pdfIn PDF document text
    • http://talleresjpg.es/img/file/36164803876.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f405167ef422611d80cba513b501f59/97636100630.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/92893742919.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16079398430366---punuvobuzuw.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5c06700c684f818e0b77bcf1f5b9035f/42480421751.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/2890923242.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/27336794999.pdfIn PDF document text
    • https://wrd13.com/force/file/nibakuvemusan.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/vuniroxaxanipiwijara.pdfIn PDF document text
    • http://bptramptour.pl/files/file/94017128229.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c772d10fd3---wufuketoteva.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/zefivopimudekafulopoj.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/48090722605.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/wexenegixopizebo.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/69798003363.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/31004720584.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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 11472 bytes
SHA-256: b490671268bd7e185b01928831839a3dbbf0936abe255f79bc079ce9b24e96b9
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 19080 bytes
SHA-256: 92b597585eec83200492b8895a14b82436590f60ed9d68483afd911be13fd7e6

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