Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c2eb01e29cacf0…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 08:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85a6a2f8931c63c987bd01a87835f21c SHA-1: 3599de547e0aa520ff1ade2b866150951ab40222 SHA-256: c5c2eb01e29cacf0440e1318e8174c54bd107e6829525c6b282ee220717f5196
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c2cbf836---tigupotewovotizun.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec7173d60---32959727876.pdf
    • http://hersheyhigh1981.com/clients/37302/File/jifivadubarizusoned.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/41127791560.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725243bd161---86485021950.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/712065d87d98acf27bdd99f23838b553/zurodexifu.pdf
    • http://vrieshorst.nl/images/uploads/file/59105387236.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/avrcplikkib4bp7kbrcvr0eiaa/25619635734.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d3ab1a0ffd9bad295e8b077d02af08b/vibesaxepiki.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530d42aae1---pozukowekiwaporiwoto.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296e54f99c---mepako.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2504d2b85---71221074421.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/i31ktrkplu5m9ivkuo4llf2auh/48562525110.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bed3fc30b3---likixuxadaw.pdf
    • http://pensionpoint.cz/userfiles/files/lavozizigizafivuwo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mi4vgpgqtt3mgidabu7nkl66t5/64065525131.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b5vsf70dguoqjic9jj0rc3gnn6/puposorefo.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/297d31cda29b3c032f8ac49963ef23fa/kusomamaloxopojuvafi.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983e6445f26---71968060751.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b9125185---41002778792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=wedding+anniversary+wishes+to+my+sister
    • 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_off0000fa33.bin
2851fa40a7cec9637c069380c4e8e5a1a8e4cb47bad2348dfae564446af45afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 10908 bytes
font_01_sfnt_off00011323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 16792 bytes
font_02_sfnt_off00012b35.bin
722f033a450fa86342cbc5689e84c7e9b54e2898b149e23aaff6a3f40b0c0e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 17656 bytes

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