Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973e5001b33a7c5…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 03:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06a1ceb75266d98315f6b78348930ac8 SHA-1: f8cb45ed3493ff56928eb9e533b8e3e13d9f087e SHA-256: 4973e5001b33a7c502fc72cc4d81c545c1a50f65688fe6ac323c16656e251688
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of many external links suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f51528abc42981f3b10428909a3dbd37/tinitugodadopawetuti.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/65219408444.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/0983cab58ebfe6f3ac890623cd16dea1/burimuwawekeg.pdf
    • http://amdind.com/userfiles/file/teteza.pdf
    • https://nutstudio.it/userfiles/file/53588822034.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f21970cfdfca3499c21f15cd5d6dda42/kudaxasisusilakuto.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/knl8v05v29focfjejurahcbov5/damobujedizanodoseramum.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983ebc15e2---tipazirivusubusu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/75366901fc9f6a4e0d64a3ab61deba93/wubixegimerazuzabiwujeviz.pdf
    • http://acecaalcoy.com/userfiles/file/21120053412.pdf
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/pibufidukokeso.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a1925a79eaa5b6f83c5e6343d970bed2/61548753028.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc5e6c7abc---gesolatazaxinikoneseji.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aihnu4t4843l9qvemq6nc2jt1f/29788883760.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0fd5a7cba50c7b10ddea2c074a379873/66066363264.pdf
    • https://medosojewellery.com/userfiles/files/50079117019.pdf
    • http://hum-lucknow.org/test/fckeditor/file/74145459883.pdf
    • https://musikkursus.dk/userfiles/file/dizejezasosobofagumeba.pdf
    • http://brmxn.com/userfiles/file/20210626041636_d6cezl.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fbb839da---87201440493.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ccf15621---12509454590.pdf
    • http://altiro.nl/home/tjerk/file/wazavudatojezokomuzoxuwew.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/781579b04d833eb961e1a55ef8fb3fd3/poxajoxaj.pdf
    • https://nanyangtextile.com/userfiles/file/94089985757.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d087e474d89---kisofonowaxodekenidukeg.pdf
    • http://www.anclupnapoli.it/userfiles/file/94780356851.pdf
    • http://kasaitogo.com/uploads/files/47157405107.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+black+and+white+iso+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin
7cc84ec7f3f7d94b6c21cbc63187c704ed543f9ecf6467afd6d7c58f9248ba7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 18436 bytes
font_01_sfnt_off00011e81.bin
347e0ed03590aa1fd936b223d1ef22743c0f2c98b03d8ae2e2032ab34065db02
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 10856 bytes
font_02_sfnt_off00013771.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 16160 bytes
font_03_sfnt_off00014cea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEA 16792 bytes