Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7349712a1fbcb42…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 09:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4a2aa4aa33c147ed30f7acfbc5c6fc9 SHA-1: a98fa2f1d282e81eddeed7f6b05afb7d834195a0 SHA-256: c7349712a1fbcb42c50bd98971efb3538a1bb4e7e6f588d44463300b0d4a863d
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=zindagi+kitni+haseen+hai+full+movie+online+123movies PDF link annotation
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/79091265891.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/77275603569.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/49013844224.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/90673981494.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/52783884771.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/wevada.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401ae4f2127---26322228055.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/59929340056.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/67116015b3fc6cf196dda157613bb452/42293441640.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/19654891759.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/peworajekufuvutimegeg.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/lideselujawafuxe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8ce17254---xanexobujoradibikupufe.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/girolov.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/96085592295.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/tirumizo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/lafenetesevelimetuvezi.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/2632434004.pdfIn PDF document text
    • http://synfarm.com/upload/files/78876840969.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/94465857683.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e753d1c66c---vabibagevavapabaretav.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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 11268 bytes
SHA-256: ac3809ed01d2e1f28afc99af07b82b010059bf0743352d035d718e407824fce5
font_01_sfnt_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 20740 bytes
SHA-256: ef57d98c698224dcae8be1c9b49bdf489ea8e54649086ba0450f94f24febda88