Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d4f0f90a7d84ed…

MALICIOUS

PDF

89.1 KB Created: 2021-07-01 00:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ed9fb15032db06d4dd597861e7d3ae0 SHA-1: b1769e7fd354cad6fe90b90eb0ae8d79a9abf2da SHA-256: 02d4f0f90a7d84ed512ef66de0146917c077d4fa0bc0af938e41bb9cb6e9d8b2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using numerous disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://charlesstreetvideo.com/userfiles/file/48758457770.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87f7a7990---14443070423.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9df07d244d1ba6ad7825130fda4e411d/83557396305.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9i133vfnpt5smqanvpjqt5hcm27f4ieo/kaxesememodidoseroxeru.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c155e8b8ec2---73228705031.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0ut9ohltdeu4eulq9msg4pvjt3/kadavakeguzomata.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5474eb37---23263468369.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9bd3c466d---pugazidefenemirizubine.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/714b7dc0a1ca2f8ae56d99c5b68c9742/tirimagiriwan.pdf
    • http://kashima.cc/userfiles/file/gotegexirunejeleba.pdf
    • https://imagebeaute.fr/userfiles/file/45450106919.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rb11tntqpcpvul0u5kkfl01icl/latefebiz.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0d496278a---basux.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a3d1282635ad5de0dec9dfe953b6eacf/kejupivedaxuzol.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/201abcc997a9285e4a6fd90df7771b30/70452690758.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0160fbe8---73821444933.pdf
    • http://selfmadefilms.nl/userfiles/files/5393103026.pdf
    • http://notarbrazda.cz/userfiles/file/66387598437.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/23iro6qmr4edt11ie8gvhk6tcc/26478575739.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7b1d064eeffe8ad0fcb477f611977e45/63060169730.pdf
    • http://szakkepzosiklos.hu/upload/file/xewodovejudagopijiki.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad4945cbc0---nozitaxiwafoxi.pdf
    • http://lyjclinic.com/ckupload/files/14438793080.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d920d9de9718c3592138c4cd3788caa/lagobexuxexigike.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7b144f55---37237001952.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+do+teenage+guys+like+in+a+girl+physically
    • 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_off0000f996.bin
77545c048a0088df9d4568a3e8ba95ccdeb0162b360dc1c13b0ab4035301e67f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11092 bytes
font_01_sfnt_off0001133e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 16792 bytes
font_02_sfnt_off00012b50.bin
d7cf44d70019cdb8c867a8b815cb9bb3735326a0e7712f6ffd31213b05a0c843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 16796 bytes

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