Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08cfcf6518e37fc…

MALICIOUS

PDF

119.7 KB Created: 2021-07-26 02:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b4958786d40b320638c23b2d5b89745 SHA-1: 85144e39b20dd69c7de515db11a2d52b2221e3d6 SHA-256: d08cfcf6518e37fc37f8fd6ae3a161efde5e52f44eff075fdc039ac39567808e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and exhibiting characteristics of a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis suggest a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://granchefpremiumfood.it/file/4486445297.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kojumoto.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/061a4782ba83f0f04777a2238aa497ef/16559631916.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a6b45ab9e3378ca9172232609bba011c/46954298786.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6u6ikaqd5pkgj9arcfqe2ug9t2/68131216821.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nbl426898h2snm2ifg4b3ij2r6/nuvop.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a305226a1---92262878645.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/98229004212.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nobemogiza.pdfIn PDF document text
    • http://plncse.hu/php_data/file/moditakefijij.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/revawaf.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf555372f---36821577697.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884b2370812---8246655623.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/41173369350.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jqga3npik9uvg8pqdhgj8sb58o/14601559642.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fateweposuluvozurat.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/67629167892.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8rikdra7uibrhu18qmovmpinp2/mawapuwuzoxawivotun.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/80706406157.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/60829785504.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/37306611214.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6751940a0---79138222786.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffd9e9b4c---mavitulubejomuw.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/gofikeduvokenefolizir.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/gunebufusijenosigozigezul.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=david+klein+organic+chemistry+solutions+manual+pdf+download+3rd+editionPDF 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_off00016bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BEC 18648 bytes
SHA-256: 502e944e892a81e267ccfb253f3965326000263d1533cbe7ba1dc0856d90f483
font_01_sfnt_off00019bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB5 11696 bytes
SHA-256: 70d800dd2aa9a02c238abc072c1157f2512ae2a393d390cc6f0624b476c4be30
font_02_sfnt_off0001b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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