Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d4c063efdc882d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f943545653a25147d91ebfb1f5995d6 SHA-1: 242d93bf5f26858dacdd82faafbcc2e811a9b7ea SHA-256: 93d4c063efdc882dcf917e4503e518c13b4bed863677fa1717ae74a8c269b28c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, suggesting an attempt to direct users to download potentially unwanted or malicious software, as indicated by the 'ML_NYX_PDF_MALICIOUS' and ClamAV detections. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/18831399889.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/af79a78ff0092585f45722f4a18fbef5/4631030820.pdf
    • http://auto-rad.pl/userfiles/file/juben.pdf
    • http://csc0516.com/userfiles/file/20210911011107_gja0f2.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/kagawefuluvujek.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210910_1F8F3741D99DC183.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9e3e944e6253140fafd3cb883df3cd1b/luwelukopuvunu.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/poliwojazojisak.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8213tlrcrfudqi6sdlnp2n4iih/89167731980.pdf
    • https://mamap.in/ci/userfiles/files/lipitejogekakivujutemi.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/24167754323.pdf
    • https://csp-pub.com/stockages/files/revisupasalijukenumur.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b6b2b713bd7d1e63c70438a5c53e82c1/58901825433.pdf
    • http://bamor.org/userfiles/file/vekesowiv.pdf
    • http://telegid.tv/userfiles/file/xosopetufalimasexeret.pdf
    • http://jshtextile.com/UserFiles/file///81251785836.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/suwina.pdf
    • https://rizecanreklam.com/images/file/sebonetojikujusuvas.pdf
    • http://vincentianssjp.com/userfiles/file/9337730805.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/60451655230.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/1901869903.pdf
    • http://atdawnwelift.com/userfiles/file/rimofomamesoti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=asphalt+9+legends+android+download
    • 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_off0000d713.bin
f092b3565091f271786a425a5d97a3b37986e2d83e328040aaef88f90b80ab77
pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 18032 bytes
font_01_sfnt_off00010558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
font_02_sfnt_off00011d6f.bin
2e3f905fa663bc976a48ffde22ffc2e2f80ce3f658a7189c06a8cf378a5d148d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10908 bytes