Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1ef24d65a8f36a…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 04:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76db58bc0658573ea78ff9771e45dfc5 SHA-1: 45b832134d218c0c7cd8a0c85e96dabd846464c4 SHA-256: 6f1ef24d65a8f36a804116dd405978be866b839109455d29b5abf3056c8474f1
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bridgeonlaw.com/filespath/files/20210908182545.pdf In PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904065516.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b3d46c2e0d51208c1d46d58db1f727c9/39984099476.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904094236.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57359ca66---jifudusenaxarezide.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/62531558193.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/99001901352.pdfIn PDF document text
    • http://exosushi.com/uploads/files/75814686055.pdfIn PDF document text
    • http://surausa.com/uploads/files/gamotesugaj.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/61290399591.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/mifinaxizotafejalewuti.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/ronijadapitakatidego.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/widifobepuzi.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/dumetijitunivefut.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/l4ifupb3e43puo5j4e07ucd1hv/pujabawoxurivibubivo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/suvegegaginisesitira.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/43050894097.pdfIn PDF document text
    • http://sksound.com/userfiles/file/fesule.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/36040123603.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/490dde1d2e7271aebeeec5c43422bccc/welozifusagagajajasu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614728f434472---nepivutirej.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/37977533803.pdfIn PDF document text
    • http://robedecreateur.com/img/files/48227604099.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/32794754488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+edit+a+video+on+your+android+phonePDF link annotation
    • 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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 19040 bytes
SHA-256: 7750810649cc03a0f38fc5ed635264116f50e65f7b18a362a68492ba876255a0
font_01_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 10632 bytes
SHA-256: ed5794e2a2c09006d00f1715e66f18046908022ba860b31c7982b60a26c0d261