Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a5e27e87d79bc4…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 19:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11973ac687ec67f7c32f712f215ccc61 SHA-1: f79ca0fb516b40be4143abf64e0532816f9283dc SHA-256: 42a5e27e87d79bc4d328a9536e715e8ae5f764f5e825ecb6c598a7573ad17fe3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

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 http://zionhillfirstbaptistchurch.com/clients/73368/File/dejoluxegid.pdf
    • https://beatmuellerfoto.ch/userfiles/files/mipemidugawevokategibewu.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e62f49220---48598902996.pdf
    • http://aggengr.com/uploads/CMS/file/fisulu.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/33b1f81d9c6334caf5626a0651d88897/45713993802.pdf
    • http://antifftech.com/uploadfile/file///2021060517292746.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/45724207020.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5be0985482---daferejinijetudemizilo.pdf
    • http://ck-kutnahora.cz/gais/image/file/xuwapodi.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd062efa8a---81376637850.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cacb9a27---98960905883.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/nanisirulomokonofuriwugo.pdf
    • https://gamaconsultores.cl/upload/file/petuzezawafadodo.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5e1d13cc4585cfddcf89a8155d10265b/sowegivevetenotos.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879d03c6ed9---3331250946.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/faaf4079c017d1344073d22bd8157389/gotofoduvuxokawetuka.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/82b1d6f4427d91cd602a6555002fafc5/detufilomav.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3687cac6d---nomara.pdf
    • http://www.tobywells.org/media/fckdir/file/zuxulalevuni.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d15027e87e0fc2d3392e7c8b8c9829a2/96012487145.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05524d778---butenoli.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070371e24ae3---pexuvedujajoj.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac481c09cf8---99980987556.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/047a7dfa30e7425b3e1356174c2e7303/92851877122.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h0nicm6eiv38quil9cgdat1uin/xidobazolupedumur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=video+editor+for+pc+windows+7+free+download
    • 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_off0000ed60.bin
f71763667e67483bec9f467778d3f4a1b6fca29e0b0db0c13cc0e2aea316e869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 16580 bytes
font_01_sfnt_off00011847.bin
af124b1df77f227289742c9e6ab358e8271580b44ac7fa6be8d41b19718e603e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 10720 bytes
font_02_sfnt_off00013122.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 16792 bytes

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