Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f33390a1140f75…

MALICIOUS

PDF

92.7 KB Created: 2021-06-18 01:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57284c89593bab6bd0dced915b9216b1 SHA-1: bc5c6d21a6a9960234f6c786a75319f25041f353 SHA-256: b4f33390a1140f75915ff278ee643628cf1e37f1405acd61d6d3d9919d04f461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c525d94e15c8e6a8fa9997ca24b78afe/54988693583.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c244645bb7---zifojikepakoxane.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u62i2o1icj4es37p5pvlo4e76b/texejanudeluponojufarapiz.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b128bfeec92---24135904659.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/66cf75b32c456eb4746dad51149c8567/63970485558.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcb1c64f7---1646534340.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b43d150e258d9e22d8a258e8dfff92bb/66168973787.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbfc0c20cf---gavazeluwogufivosavomi.pdf
    • http://asfalon.com/__files/file/16304051617.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91ohnkjjdd7v5bkd4njmfehdh3/54610474510.pdf
    • https://aspaeng.com/files/image/files/60275137163.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/9d674544a2038bfe18b144225e5a9d96/giwiradufewa.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15ee17e70---raguga.pdf
    • http://asesorgubernamental.com/images/file/50198928038.pdf
    • http://andlupa.com/userfiles/file/97489931055.pdf
    • http://provia-events.de/pics/fotos/1/file/kexokajafafemadozidiliko.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdab0861e---dunuwoge.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/127e417f85623219b305b691760aa4f2/52925387733.pdf
    • http://otvorene-srdce.sk/userfiles/file/gazifugiwitusagapepeven.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=martyrs+online+hd
    • 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://scripts.sil.org/OFL
    • 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_off00010b65.bin
f0758320a9d8d499041de34325f906d480e252e3b5d24055d0022673b7f80a37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 5020 bytes
font_01_sfnt_off00011c80.bin
7061cb86a474b2193b67421724a019479c66c7a9ed15d0f9234fb949a94de910
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 22856 bytes
font_02_sfnt_off0001504e.bin
fcb198262e0486c21827129ee8146188bf4a99d5bb39957528cdd8bcbc4e986b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1504E 16240 bytes