Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acfb68c44e242fa…

MALICIOUS

PDF

93.2 KB Created: 2021-08-01 08:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8177afe2760591538b25cb438985b69e SHA-1: ebdb974c0bc3718079346511930b72d9860db616 SHA-256: 0acfb68c44e242faf106084381042a4c9ad81e863bb5edb006b0bdcfe3547e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous links point towards an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=banjo+trance+dj+remix+song+download+mp3 PDF link annotation
    • http://gancza.pl/userfiles/file/kafunurasegib.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/272621015.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/puzuwebitirowava.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tqqt0so2m5d3c2h6qkp0mt7jl7/43418488975.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098624e9772e---67436627297.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9873b6cbdde1ac735f7015f8962e3d4/kukov.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/9266988877.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9b3d56d8---7660613895.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/82424273537.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mutavapilusazomixug.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/11886720598.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/wulanupur.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d3b2c550d---gidoxubunov.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pumivarutozefamobo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/salesibipuletakem.pdfIn PDF document text
    • http://learningkey.org/userfiles/galubulisa.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/72296963850.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b53bdcad---62812219437.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/43338471421.pdfIn PDF document text
    • https://derfo.info/resimler/files/tuludujekom.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9e08ee419abfa0577196c5fc8a32fcca/mewemoxixewesamo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb56cce324---22828690659.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728088bbf3c---11023599285.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m6a5v9j5rf0pepmdusq4jqsbn6/51713514995.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_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 11400 bytes
SHA-256: 782907d2cd4c3420c2d70d63b41dcd29d44277f7000d36fb8ee0e8c39c9452c7
font_01_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 17620 bytes
SHA-256: f64d26c8738b7576d3f721c764207ae964198ea8e1e4e63368458efd2e905cf8
font_02_sfnt_off00014da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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