Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1a9695bd154e4b…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 08:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf0c861fe2986954b5c9273d75b2fd1 SHA-1: fa31b7bef39f9fb710b2d552eb2a18ce9cafd24c SHA-256: 5d1a9695bd154e4b63fb29e90707fda00b5b2288f361cb4520f8dd3cb08b66ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the presence of many external URIs strongly suggests the document's primary purpose is to lead users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=difference+between+clause+and+phrase+and+sentence
    • https://alutat.com/data/file/monebimusamemalavafiri.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xamazuvinururanopukulazox.pdf
    • http://fanti-fitness.pl/uploads/assets/file/31702292908.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/49800569911.pdf
    • http://malbreil.com/userfiles/file/38746931254.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32d6ebd18---kepenirel.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/94713989163.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9f5f154303c8d731455f63ad4a4cb342/5715573883.pdf
    • http://allasclub.com/campannas/file/1516048802.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772821974c1---mobefegixefuxa.pdf
    • https://ortechindustries.ca/ci/userfiles/files/gelesajufamax.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/cmsqvr5qn93mmcgpf83fao1qss/venesolenoni.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098680e7ec29---51810779657.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4rc4pjacei4fi98n2d5o2oldk5/zizufitukawaje.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b63cfed9---maxezonupi.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b2d4d6a4---jofibovaludemosakigi.pdf
    • https://serviceservice.eu/userfiles/file/xenopefakijowodiwena.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710eb17fd1f---pajopuvepivutuzivizaraf.pdf
    • http://iseveranscopy.com/upload/editor/file/wuweluwosupev.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608199d48a3d2---72446131792.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c6d4a5ecb117dab8422ce17bb379402f/degafuzomoguriweresenude.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a7.bin
05195e3d2583e388e7537489b5e404c70e20458d3e75a27ab0d72fc8982204c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10924 bytes
font_01_sfnt_off000120c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
font_02_sfnt_off000138d4.bin
e4811e3552f3a4236a9624a3f54185bc71318294d2a26d09ffd6a72927954732
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 18092 bytes