Malicious PDF — malware analysis report

Static analysis result for SHA-256 648afa4ff1b74295…

MALICIOUS

PDF

148.8 KB Created: 2021-06-26 11:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: def3680c915f9a0e39735da2c6a0a3ff SHA-1: ab7da63ec87c72bb0437038431844bf7d7410976 SHA-256: 648afa4ff1b74295844cfef51a30e0ec9791659ff3da66aaea60e38eee44bff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c381f1f3---zusufisopepazuwami.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076737bd9a45---dozidokavibaz.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e99c6d7c---dapilegag.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f797e1922b---mafexo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/37jroblumebivh3bjd15ovm0m1/70613395158.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38f071bee2b65ef3b9a1c54e2ba350d4/43832083671.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/xonajosabojelalogu.pdf
    • https://toskov-yordanov.com/userfiles/file/66443071374.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7e2314d1edc5609fa63f40837ab1d235/piliz.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11bec5788---48232566368.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160818cd9326d7---35200794729.pdf
    • http://lnianemarzenie.pl/userfiles/file/xufelitinakar.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/946d8176a377de39726cea6456de48f6/jofasamupigilevabunojasa.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d387c98866f5727c7ceee7db0bb3cd02/76833347010.pdf
    • https://tezerwatch.com/file/upload/files/06-10-20-57-52-94.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f03ed42a2e6b7371fb0641c8a8886415/jinevejaxofepad.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d621a44f9---kurijiwa.pdf
    • http://jtour.vn/userfiles/file/vijejanegabikakenividijel.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2d57e62274b4dc7715dc15b95e3de278/98638133049.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1811c338c6---diviguxutudafemewivapat.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/82de6db89ad85a4e64c23f73a3308352/86558944325.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=linear+and+binary+search+in+data+structure
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cada.bin
77d3d5807f2c14c196b38845a34d31ebcce25bac4c53cb7d7441c2489da452a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CADA 10612 bytes
font_01_sfnt_off0001e312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E312 16792 bytes
font_02_sfnt_off0001fb24.bin
2c1499371a0002a4abe696a4f0efed11345334ef03e9a70d2e12bf4056489844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB24 19940 bytes
font_03_sfnt_off00022fad.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22FAD 16084 bytes

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