Malicious PDF — malware analysis report

Static analysis result for SHA-256 608435115007c83d…

MALICIOUS

PDF

80.2 KB Created: 2021-08-09 14:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 256678d58ee0fa22d7ecc51d8dc04f8d SHA-1: fd402a576f09ece09b351524f60fc745fb949110 SHA-256: 608435115007c83d335bb63d6fe13dd44eccd4d690ea5fcf74468c3ea7dbf290
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by numerous external links and a link farm structure pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of external URLs and the PDF structure suggest it may attempt to redirect users to malicious sites or prompt downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=canon+laserbase+mf3110+driver+download+for+windows+10
    • http://stjconsulting.it/userfiles/files/tanimepofanutama.pdf
    • http://asbazainville.org/userfiles/file/balawumuli.pdf
    • http://raczcsalad.hu/files/7999746435.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/81065532763.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd78db3f5---45748797606.pdf
    • http://bjxbw.cn/userfiles/file/4448818438.pdf
    • http://cn-junsheng.com/upload/file///20217155285095.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/784akqaufejrfsepbu9eaah195/62455352286.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/relor.pdf
    • http://sgyscom.com/upload_fck/file/2021-7-7/20210707061455749364.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/baletu.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/38ac3b03d0cb2397b8b1f90e0b32259e/58661684389.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c1a6fbfae8611ee82de07f2115df9de7/mogebijuvazosutima.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f05f91f064b1efe4177b3d2c6e793f0b/dezoxivajujuvemun.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/15cdaa31797e04a36b74b7bd93ab3421/ruwenexevatam.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92fe15dd6---46454569146.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071aef8acfe2---44736532541.pdf
    • http://nenorm.com/files/files/3248525549.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7f85955441551eab45339006eeb2aabd/84856365621.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ddcc00f27---sitozadiwawutijoruwo.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/fuwesi.pdf
    • http://kaowei.tw/image/files/20210528_014724.pdf
    • http://stellarp.com/userfiles/files/89365113388.pdf
    • https://motelandratecuci.ro/userfiles/file/17637244493.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin
ae2f7ba1c0c7670cad42a80f4fe29cc3b97ed9aca761226540ea1dd3b04887ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16496 bytes
font_01_sfnt_off00011d28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes