Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eb9d0e35e47972…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e58b789af8aa2fdbc984fa14ad336fc SHA-1: 82876991a49223a0a30d1dfcddd54bec80a44a11 SHA-256: c8eb9d0e35e47972a1096d5764608e3f1ad68e768539d933e10a6ee4e9856168
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. While no scripts were extracted, the structure and URL distribution strongly suggest an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vivaibonomo.it/userfiles/files/90656086451.pdf
    • https://iqmuseum.mn/uploads/files/fumejuvutenabapore.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803a553c21---rejuridesuseruzigekojuwo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952afbc5dda---golavusozonujinadudi.pdf
    • http://seattleteriyaki3.com/uploads/files/43907558487.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/528a7c04038aeffd15ee8e72fb89e309/taxoxemuragenisobekasebuk.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jofg5d0cdmvl3h558u6t7t0n46/63668598312.pdf
    • http://epicridesnepal.com/files/xenukuxaje.pdf
    • http://stepasidemedical.com/images/uploads/file/91511276691.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acab95acd---81642720398.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4966df79---42453831361.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0a44842f---mudobamivarozepotozupeb.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofjk8lif2s97dsv1p8sfb26bj2/9939044624.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/74f11cc1025ceb59e409c143ed55344c/kemalugato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bitwise+complement+in+java
    • 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_off0000e686.bin
6635b7dfede62b8980b759a2e27d31f06ff799c80f3fae107fed56bfc62029e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 18104 bytes
font_01_sfnt_off00011724.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16792 bytes
font_02_sfnt_off00012f3b.bin
336497b8ab67cd80553374dbe45434cc5c0cf674e74af93f9b4dde793d5b68e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10768 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.