Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9931d6a32d10312…

MALICIOUS

PDF

76.6 KB Created: 2021-06-26 01:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bce6afaff220458ca64d9f38706d5b0c SHA-1: 60c4987a664efc7a5306a65c1f5e2d03e53780cb SHA-256: b9931d6a32d1031241570ec541e80dd937ddb63ecfe32be122306803f294f0be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing or malware downloads. The presence of external URI heuristics and link farm detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crysiq.ru/uplcv?utm_term=streisand+and+buble
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/34c9618dd6df2a12d24415921ba5f995/67809479039.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6c46beff2c1e41579017ba9acec3bb75/wazezafevotogadi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1aced0bfe---29664371304.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa205360c9---ranol.pdf
    • http://daehwa.info/uploaded/file/95274012989.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/80jc8k7l7vdd2g9mhp7tsobvkp/bofagur.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840852bba26---zajigaxusi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/zepabodaledama.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/630286501d440366ba2303dc9268a057/23988131859.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985800d732---wobejuwod.pdf
    • http://fitviewer.de/files/file/10637739130.pdf
    • https://arerp.kr/data/file///54206925969.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1403f207---dekalagukunimumalogegu.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/15638dff27ec5397549740a7abdd24ae/34896686973.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/590c67e5d019a47fb1177f1df9239bc7/1404093031.pdf
    • http://massageindex.nl/images/uploads/wapugepesipax.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gcd7ob803hk9qes1stot3c7805/85014210374.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e2051734---ziwazoguxupojobebifuzopi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60ecb4a7a---18450337547.pdf
    • https://247christianity.org/fckeditor/userfiles/file/140850974601622026187.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bc4aba12d8c1e43138ad2082f7fb4af2/73728730882.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93c9b3b42a2d75e61a0c05167a6406c5/6554434865.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c827a64cc---wesezixanipi.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1c84b2f334fef0fae975988410dfa4f1/bames.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e725a0224---31574275593.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607178524d7da---lixiwemezijelawufunexeg.pdf
    • 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_off0000c74d.bin
c14e2eb0df66f87be22294f94a27e798ae8f0ed6d93a4d8cbdd42a7461b218e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 17396 bytes
font_01_sfnt_off0000f40c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16792 bytes
font_02_sfnt_off00010c23.bin
650729399045741b64eb79b32b84bde22e8fa13f2bdecd31c2aba70d6bc23194
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10436 bytes