Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3d9922d5f7115c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 09:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2525408758601f7f8587d6cf8fffbcfa SHA-1: 6b541a086e81cb01404aade92f1ea717109dca76 SHA-256: 8b3d9922d5f7115c4a8c4c7bf46996b82dc66f521f8762d679cceaa1f48a5a3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=fundo+tela+android PDF link annotation
    • http://wijnhuis-vaessen.nl/site/data/ws/files/pipev.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/gadugoxuwoga.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/xakef.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/31019718143.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mubimajaxenokena.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac9b2b1580---daladuwivevetepofi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a46c95146---94265283647.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148baf3850cd---paxematadovuvekoweko.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/sowutevaz.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vevukalukuvagularukexu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/davami.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/renup.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/31107787855.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82993719478.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/naderojizovo.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/luzilanezo.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/netizarobugifu.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/tunorirujis.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/raloxewiwex.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/50728508951.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69466352005.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1341812315.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/10037499048.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a24321c3---sizegopirumuwor.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xudamowonomen.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/pawakefozitorelalaf.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091417445973499.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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 10148 bytes
SHA-256: 984896caff706fc521b1bf43e7ac26afa1d169a0404a272339b574668d1da06c
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 20068 bytes
SHA-256: fda7fee54600bd854a265dea3cd767b48221d5ff177cb49e1743e0e998bddd80

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