Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37ce771b08dbbb2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 12:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc3ad3b430c9079bdead7d5479df7107 SHA-1: 85445ad381c01bad25a023a044df20386b79b277 SHA-256: d37ce771b08dbbb24caa19e8b9bbc3d06cfeb458803cdf7b566fcd28d22c1b22
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 hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70e65ee24b4fbcfe23bde7485acc2492/togetoletil.pdf In PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc0fc8152---22924039124.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bf3129a7c327bb7b70f67dba10f65b41/gijufa.pdfIn PDF document text
    • http://pk.mo/userfiles/file/76783759782.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/58945153274.pdfIn PDF document text
    • http://hodori247.com/uploads/files/dovekigororoxadegag.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/fobepugivogozefov.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/68093926793.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/derarijopoxedevupuwovo.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/30401364088.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/5032883862.pdfIn PDF document text
    • http://dongphat.net/upload/files/nupelejuf.pdfIn PDF document text
    • http://beijingteye.com/upload/files/98441523415.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xukarasogelumezunede.pdfIn PDF document text
    • http://dkind.net/userData/board/file/fejasaf.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/jedaruxebogivexogob.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7fkj9dmkg3bqfinum39p53j8fk/86852420267.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/jebamigesabidu.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xotasiwidexunenutukaj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5246c5a3---guxafa.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/82877808980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=true+skate+all+unlocked+apkPDF 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_off0000b00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00E 17104 bytes
SHA-256: fb25c2df2739fce3ef4ff4bcf8a46ce5c681485c44111db5eae21659cc1b1950
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10572 bytes
SHA-256: de975e880263dc6816d1a96c468373555a31418c49c12d02ae5c0a4084508012
font_02_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1