Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fa42ccaf1bf41f…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 03:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5bcd917d1a74d084ca4b8b9acf4bfe9 SHA-1: 83ffdf13cab04ee8fcbfa722313e49df42ea9070 SHA-256: 43fa42ccaf1bf41fd6a797166f42cc08c2d4990c1d946e29b72ac561b658780f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=is+phosphorus+trichloride+a+covalent+or+ionic+bond
    • https://cuacuonbentre.com/upload/files/4347840800.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/86b1bc420c883d798843f3504d611309/46267568272.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/67d72ea739fd3358e8c6a97276861881/66497426657.pdf
    • http://nutranghongngoc.com/media/ftp/file/24931069456.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd522902f47---36453184740.pdf
    • http://cokhiminhhien.com/media/ftp/file/xokesutawa.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cb839ec4---25719437707.pdf
    • http://abwcrainhwy.com/uploads/files/60783551382.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/vunopuz.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea693e01f---39172690070.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dababf5bb3a---95294607287.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/38334708690.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3e44892afa89a9a72789c239216351ca/81637946509.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/62bfec1a18463f6e833ba9718421356f/gapejumewinekawojanimorej.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ee6d5a53e6222d0750b43400b33e60cf/8828140316.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e3df69ea30b8cd156feefa503ae2c698/36495148932.pdf
    • http://www.hgbehringer.de/img/files/files/15152155240.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e2264c6a---vixideraxip.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e84ee257---72793497260.pdf
    • http://arunimaflavours.com/userfiles/file/jodatufofe.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/17393096473.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/67374796880.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8031d649---46078489771.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2385a77b---97819223109.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7be49585---14487587168.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin
ee4b906d4991331a0ddc5ba277d83964c87808b4ae7d36482f1ee90283f9d87b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 20928 bytes
font_01_sfnt_off00011f24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 16792 bytes
font_02_sfnt_off0001373b.bin
bad186d2d6dffaa11c7f28141b5bf4befeeb8711c06e74d499882b2e6de80100
pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 10868 bytes
font_03_sfnt_off00015012.bin
785bc3c2d5b30b5f10705642de710209f85f763c87c74dc111cac3e1603c8281
pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 16364 bytes