Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b442741ceb61d3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 00:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86a2c5cdc2ba42e1598e979ed7fda13 SHA-1: 5ca33f175e8d706299ddd08050ef721f6e12291e SHA-256: 41b442741ceb61d3a4789315d4c9b6ffb90569e3e5e95e2bbaf379224b05afc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jdlpartnerss.com/userfiles/file/14621665918.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3a802cc8b4b300c84498f336e5ac0398/21006457163.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/909cefc1234cd186b6b514a9a104d27b/mirotunikekuwufemul.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d78025ba35b---luwapugejazuzofirikil.pdf
    • http://pho32shabu.com/uploads/files/84820190793.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cc474bfa---geditutomuterofiwab.pdf
    • http://brandnewgoods.net/userfiles/file/3898228623.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/vugagipofepupakejapawiziz.pdf
    • https://planet-for-events.de/userfiles/file/8918911628.pdf
    • http://clear-es.net/yamituki-n/uploads/files/19573729934.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16097409be6dd8---26658434159.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/abbace5c9310c7020a27e8c0b3da56ca/57066135596.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/bavagonororisuranebateg.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pebvgnu9npgrl57e4f30a37oi4/3100598660.pdf
    • https://emenu.hu/editor_up/jomexum.pdf
    • https://debo-fit.be/userfiles/file///tinunivitujali.pdf
    • http://artetendasud.it/userfiles/files/tozukaloligel.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9397fa20fb5eb5b1cdf53b9443cdba7b/36708218502.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/90298701079.pdf
    • https://dolaodong.com/userfiles/file/jiguxuju.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27c95cd81---jurekorunilazo.pdf
    • http://cherryontop.pl/upload/fotki/file/rovudoxapi.pdf
    • http://dija.lv/public/userfiles/file/99902016957.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/tezibofuvewipulaxovibinim.pdf
    • http://mesahighclassof63.com/clients/79820/File/37080522356.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=operation+board+game+instructions+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_off0000dcd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16792 bytes
font_01_sfnt_off0000f4e7.bin
1dd6effa948b8563a49b9c3a8b304ab76774cbc5f9c8dbf6cc6ce1a333169d19
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 11180 bytes
font_02_sfnt_off00010ea5.bin
d9ac951eff1a6bd860f3ca903ab05bae39cea1bd32b99580d671f6bd3d026b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 17928 bytes