Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9abd9af4f1af373…

MALICIOUS

PDF

100.3 KB Created: 2021-06-25 15:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a6868c9aec96b2d04ab6db78daead9d SHA-1: 8c34ed28e16e92e21b6699858fda1f07f5f5a8b0 SHA-256: e9abd9af4f1af373e8890f9e774f50f3136044252e9455dac5e724b57b04109a
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules detect patterns associated with SEO poisoning and compromised hosting used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f688cab672---89798651432.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096461f0d075---54144714741.pdf
    • http://tydafa.com/dafa/uploadfiles/20210608201906.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/046af33819468e89a3cd734564a40d99/vinij.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66e71688e---posofaliverepez.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f9a3d5c3464dae5d0dfeb83204f8db7/warip.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/53915934971acc230f6385f84691a7b7/71707188578.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rqqpgu9bh86fp2469u22p5f5rl/bijoli.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7421aa71---zavoturaza.pdf
    • http://ipceurope.eu/assets/file/8072990727.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a432ea900---83349777945.pdf
    • http://cnkls.com/userfiles/file/1624507265.pdf
    • https://cottonweb.net/userfiles/file/gixadumasenodelezo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=notion+task+manager
    • 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_off00012917.bin
969a71a118744ae0fae01ad11918d130dddc9db50c6280187dba26d851427ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16852 bytes
font_01_sfnt_off00015531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15531 16792 bytes
font_02_sfnt_off00016d48.bin
d6a9a4b00db4b86445827b2a3e53a2ab24173f7042bbe51ccc3d0ebe80639434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D48 10476 bytes

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