Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e642173cca8ab81…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 07:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45b7064e39da6ec9e848b7b219a266cb SHA-1: 3c55d54606329f5d6d0b8fe99c9ce39e62b4c128 SHA-256: 5e642173cca8ab8103a3b2b5bd2dc4a7d49c5f5c45a0286299c15cd53ed64e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://behagi.eus/files/galeria/files/12388899157.pdf
    • http://wecans.net/_UploadFile/Images/file/89064217279.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1500b51e15---60866985391.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbf76e0df---sukegopotilaxawanena.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/afon4pbe2h8610k4dtgrdrlaso/31085118542.pdf
    • http://beerskiboot.com/img/upload/file/21379325776.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2628df58---4425108184.pdf
    • https://rumusjitu.com/contents//files/vuniwupanamibenux.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c0387d5e---pojebaxiwa.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/249d96d4f56b515c75120ad6c3110b41/62566116597.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db658f3a8c---tegipokuwetebafupo.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29551d431d---gigekemukakonuxu.pdf
    • http://acecaalcoy.com/userfiles/file/tozezelubox.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/58748523477f199013020e556a2c9347/kikowituto.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1ggnlhoiddb2sl89ieinligp9a/luseroluwuneruv.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749f5a2a0b8---kabibigunuvo.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9376a271a---41481551681.pdf
    • https://pet-fashion.ro/mm/file/fadilexejilutiv.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d2ca22e8eafc358493f389312660725e/ziziwutafepugola.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b265be595---muvufevojemuredosexaw.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/86a25eb8b983cfb5c3feeb407e47c8db/37965387471.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kpl9kcb084pcsmv82j68km893t/48851534803.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/c1rikrnsegns225gto5b87jsj7/madikasuno.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hat+of+disguise+5e
    • 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_off0000f74d.bin
82037a84dd5394440c5436401e9d5a88d7fda8835362fc4d7afb4a00b74c9539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 18544 bytes
font_01_sfnt_off000127f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 16792 bytes
font_02_sfnt_off0001400e.bin
0b83b09762f8306a73ea815c33bb2f48d7a89201f00d59b566b815c086c99941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 10504 bytes

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