Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39df5d5b6ad9455…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 01:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa3f1ce7e96acc0111fc9eb48b724c0c SHA-1: c122bf878ae96fb09556c64750461b42b9cb304b SHA-256: d39df5d5b6ad9455af561e8b828f0edad09e5da108833af631ad745f0b1a15df
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b75af968---56462454197.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dc143f5c---nitegajobajamekuzam.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/2013323078.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/43126853267.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/davukerukira.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326626de1be---81040684713.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/15531611997.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5e8f3645---22930747136.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/biludofexapabusuja.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d707197a5e53b8de349d0e63ee438304/gulitobobuworedajaxaz.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/32390123256.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/84142219910.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/82721174929.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/pizemepofokukozadal.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xinojibuja.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/79239767511.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/76838687437.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/87551795816.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/45516667220.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nulizozi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/kulejigonoranuna.pdfIn PDF document text
    • https://bloc-immo.com/images/16497499780.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/85808924849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=frp+remover+software+for+pcPDF 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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 17848 bytes
SHA-256: d722d5b08d690a499105ac6ec1113e8f0ee310f8199c003100f321d3c228e48a
font_02_sfnt_off0001370c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 10528 bytes
SHA-256: c13c78d9bc8cf3e41c1afc0d51d38c9b3f43e7b3ee9c1d5a8bf7e6afcf7c4b00

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