Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b5e3f7a673ecb2…

MALICIOUS

PDF

99.0 KB Created: 2021-08-04 08:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa6a8f8c0c26cb3e29786d99ceef6ef2 SHA-1: bf964af7822dc9c038e4a3ebfbf0211a8d4679d6 SHA-256: 43b5e3f7a673ecb275de3a84c27d9598ee95a322faa33f686f33483775af8295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=python+programming+pdf+for+beginners PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945ec929015---najapixibuvosaja.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202106300748271834.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/84476136930.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/majumexejuzamogemiperison.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1bf2bf41081ad68a8869fa9435248b05/68862413194.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/11110011437.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0013f673---lapobunetepenumaxemeb.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072632d72e18---74132159894.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/43940311233.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/pibumi.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/73855171208.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3424a5ccf025a451553363c4a54a8ea5/xixepesavegasuvoviget.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jenomavosonororox.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/7df0634ad8d3a4848c0b82e8eaaa4304/73784295877.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/buguzosofirevena.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fc5dbb0a4b0e690c65ba4efd296708c7/vuzorodojimunepa.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/22965419221.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160778cb860be9---bogejaf.pdfIn PDF document text
    • http://scro.ru/pic/file/14254050966.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/fagudi.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/dezizexepinixada.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/10582430701.pdfIn PDF document text
    • http://bjjiffy.com/upload/20593921141.pdfIn PDF document text
    • https://ferropula.hr/files/xakibuzewurutoxoliwob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 18136 bytes
SHA-256: 2a304528c5441c887bdd42f79047a3a7257a9ba6ae65b44fafeacdebb2e161ab
font_01_sfnt_off00014bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C4 11152 bytes
SHA-256: e4d92ff16efa185cb0af4de8efe9009222d04361624c211b252c6777b5a56397

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