Malicious PDF — malware analysis report

Static analysis result for SHA-256 726b53ff5d3e2e10…

MALICIOUS

PDF

63.5 KB Created: 2021-06-14 20:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 69099efeb6c97075a25670560aed694f SHA-1: b6ae0f27cca64226b6bc7725253ff0ebb2a988c8 SHA-256: 726b53ff5d3e2e1080ab0a281317205adef49d09ceba3fb0141d2fb4ba9f877c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=manual+de+formulas+matematicas+fisica+y+quimica+pdf PDF link annotation
    • http://aryajob.com/user_upload/file/nuganopuvilex.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084cac70460d---8826430852.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b28edcfd68d7f1ade5cbdda47fb20a4/82082185673.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9864ada88a25dec032f3c4d1de52111b/lamupukesogatovenolowes.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b15247c2e---vujufekibepup.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69de845e45---36188981903.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/19qthrbksqov73ni0l06nl27lr/45319163585.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2f21b641281e49f508af48db00feec9b/15015658503.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b839fc3acf7257dbf3e3377f49b90f29/wiveperevuwoki.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c57ec972---89900822635.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098377a54fdd---54453913411.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/lodasitujiwolinex.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/riluseparutelari.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8n6q9ec5n9gc63ekc4e7r0uu2i/nosidenokowokoji.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/mesefakisul.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e339205f6c---28860512690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 5532 bytes
SHA-256: 6fddaa24e52890cfc5021dd77fabd9216ed70a3ca4519192f87db72ca0d7e023

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