Malicious PDF — malware analysis report

Static analysis result for SHA-256 666ea1bdba5f9668…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 18:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4767539a6141ee21eadfccac0415e347 SHA-1: d4c3562bcd7a9e147456f197aa168d7349729de9 SHA-256: 666ea1bdba5f9668037b55c2ea4a8904c32d7c68456e4ae9e08e050a7412da55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://i-daa-wl.de/userfiles/30670887429.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e336c0ac---zasilofowosonun.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/16707267849.pdf
    • http://elsekmont.eu/userfiles/file/97078240306.pdf
    • http://evohome.pl/userfiles/file/mepogijuj.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo14nthmu8v99jpbipgoclff5r/mematalatotodepuri.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d1669121---28634244225.pdf
    • http://ferrocom-spb.ru/userfiles/files/gemazaw.pdf
    • http://benevolo.it/userfiles/files/boxugobizilexodadura.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r2jmogv1b2rsk7n98lqtf87mgd/72635505868.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e4e768c3---vutadukawupo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e822c4ad8---87459417727.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b426dd495b5---vepasejikete.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/joxawis.pdf
    • https://atraba-holding.com/userfiles/file/76548458053.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d46b9677b29---koxomumafemusipiwa.pdf
    • http://daoltrading.com/userData/board/file/kajujinegowebagazeboro.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/208e18668ad9a212476022fba74e5c75/25389151676.pdf
    • http://kozelskadm.ru/files/uploads/files/seresefugodoz.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aed351e33---gutepevidut.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af69aee3d966ad7a3e6e71f2c813689f/90433775003.pdf
    • http://deltastal.ru/userfiles/file/dotodovagik.pdf
    • http://bishnutoursandtravels.in/userfiles/file/zopivivopugi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=squeezing+sebum+out+of+nose
    • 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_off0000eba3.bin
393d3f0f01c4e02ff61d4b5d1ce0fa3af95f6410e99221981aa16e7098f559f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 17096 bytes
font_01_sfnt_off000117cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
font_02_sfnt_off00012fe3.bin
2edfe4a8c110f440206081d594a4dc8cd733120010c2b65e794059d2ac68413c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 10772 bytes