Malicious PDF — malware analysis report

Static analysis result for SHA-256 d626073b75ee3823…

MALICIOUS

PDF

83.4 KB Created: 2021-06-26 06:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7a23ab109370add05ce9bdca05b0f78 SHA-1: 2ffe2e358f4636b6058e15a34b82f31ecd0ded4d SHA-256: d626073b75ee3823081eb7bcc35bf06d33307677bf176e70644a84df8f059ccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=is+blue+watermelon+real PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840780deee9---31725624697.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kijanotajuloterako.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2c349ef36e3201ce8b53477f8cfce67/25515055703.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xuvaponelage.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/votadepitumiruroxajene.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cc9450485f7aa593b596505b1edcccd4/ramurixikedekod.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe88cae3b---rapadedofowe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4c941266---967719473.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/demawedapafowixozuxafejeb.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc658ab02---84399989307.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/homd9q5o02unlkisachhfesp07/nojewuripon.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5m632d5nah8n8qq1tp0t2miqt6/vasurugox.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608429780da23---7280411062.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160907803ef887---53114988139.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/luviparutojeratira.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090450781b85---togodimiwelarajilimigefu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b5bccd3f---puxuxitalomizidevasimur.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f4704ee7b63d77635b8080b84a8729/powanojajibatumaleg.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/fuzawekilefovekudak.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/mimilizesoziposazukafuv.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/52141424987.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef8527e67b---menujufabonefagenad.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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 17248 bytes
SHA-256: 1e3946fcc6408ef1bda4b195ac1fab4f660650f1a3083c52c18780d1145bfe95
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10452 bytes
SHA-256: 38834d340b7da2efe49df8bed8e257756d0833962bbcd3fee7f60b69c6c1ec61

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