Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b48d5adf22a2547…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 10:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8740f45ae9d4cb4e23a11f63c2b407f SHA-1: 6a9045b300e21b91eccfd71aa0bb12bd758d846a SHA-256: 7b48d5adf22a2547f586994679b0e7b540d2f2ab72b4b7c4b6fc58eff9b0192a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=in+app+apk
    • http://pro-group.ru/userfiles/files/35082196358.pdf
    • http://timebymtm.com/upload/files/biresefuvowegap.pdf
    • http://teedinmaesai.com/user_img/file/82882432311.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9ae5dcba4---vowirivopelivebozibilel.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/76398498100.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47f05e90846a5727c69fb385d987e5fc/70170581792.pdf
    • http://pneusmarene.it/images/file/roxesumes.pdf
    • http://sun-green.be/ckfinder/userfiles/files/nijofobevewuma.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1da5f3a14835f3fb374430b188b67abb/68268522116.pdf
    • http://unsersohn.ch/images/file/78260055730.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a4e2611---26394110572.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/lijerazaz.pdf
    • https://cleanenergy.mn/uploads/files/jujedafurisuko.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/roxazunexojavelamigezusi.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tikakin.pdf
    • http://yjccnc.com/upload/files/66707943450.pdf
    • http://revize-elektro.info/UserFiles/File/jekudawerufuwojugidoxima.pdf
    • http://agataklimowska.pl/userfiles/file/36857012200.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/lisiwibu.pdf
    • http://nwatchonline.info/userfiles/file/wavig.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/febevowotetesovolinuj.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2c225f645---28828244785.pdf
    • https://istocdukkan.com/userfiles/files/47670145620.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/445e7d43d74d2917f836e94c161d558c/55342984099.pdf
    • http://zdrowejaja.com/Upload/file/79658683434.pdf
    • http://alompar.hu/uploads/content_files/files/senagowulirirubu.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/e1r7qki31cqejvvn72ctc78mi6/57793879775.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_off0000b93f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16792 bytes
font_01_sfnt_off0000d151.bin
5577bf873a3a57abfd069bfbb6065bdba518d59197b079a199524ab70b6b9aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 20860 bytes
font_02_sfnt_off00010758.bin
570c5e1f57cbb4cb98bc5fee7b4e325a639dfec430f388c431e5eebe16474ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 9532 bytes