Malicious PDF — malware analysis report

Static analysis result for SHA-256 370bba3d4c0e04d5…

MALICIOUS

PDF

128.3 KB Created: 2021-06-28 09:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9725d83c7598e12ba4b6df6acd9a9d08 SHA-1: 03e74caf5b3ef029808e0434c29f8efea5235b82 SHA-256: 370bba3d4c0e04d5cc1fa724a79bdb3683f985ec6838170e24a3b95d6796c1da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://uleshuzataruhaz.hu/files/file/24709807725.pdf
    • http://tuzvedo.hu/elemek/file/futoxid.pdf
    • http://csim.jp/ckeditor/uploads/files/bowogesimazal.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/acf04b51d65e7ffbf4fee9141e6f5782/13209029014.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/41548573486.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/003e53eed4d4f98c3064b112bf126f09/56626892543.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977b206c83---56898727433.pdf
    • https://cristalensi.com/public/File/11008857788.pdf
    • https://landbar.com/upload/files/witepubuvanov.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ld93c3sc40gql841gn5j39nn4l/95933605962.pdf
    • http://cartonwrappingmachine.com/userfiles/file/lakolonojawitijemom.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6bb14970b---6942014580.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6af1bce7---foxazenudi.pdf
    • https://youkuvpn.com/upload/files/zizoja.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b87ef667dbe1cd71e7528f5392b00f92/kukeparewalufabesileke.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2709ff27c98fe6f6ddf4725826e2c724/51643652199.pdf
    • https://ayurvedaemart.com/uploads/file/mixokoviwodipad.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/68185673210.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/6f1c097fe55f7f5c99dba509980749c4/kopilomazidoka.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e91657bdc---18778943655.pdf
    • http://alimentosldm.com/userfiles/file/30403027328.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v5ns4u64teapn8nrara232nksh/47984683665.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9932a06ed8b8c9a34bbd2a4ba2019e32/jomubirovogovi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c56dd0c1b6317fe8bb7c48600dceed68/xatonakogiguzi.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a5af668468b06754b3d4287b3999e40f/43745820099.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kgf+chapter+1+online+movie
    • 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_off000191bb.bin
6d857674733ef78cefd3dfc12cf91a1c3d8b48288d7cc83367dc61822b048cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x191BB 18228 bytes
font_01_sfnt_off0001c267.bin
dbba3b4e4e32178c834511adb7d00cab4e493b1c49cbbbfaf271b647372d04d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C267 10868 bytes
font_02_sfnt_off0001db63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB63 16792 bytes