Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf56701c9f25ff17…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 01:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eb7b0c60894c084ca1150608a106bce SHA-1: 938e73dd8d28a9400d6fa07fbfa7b8c1c0d15932 SHA-256: cf56701c9f25ff1772b52e8e1387caafdcc8c29b647b52046781b3bcf4a1fe57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=automatic+daily+instagram+followers PDF link annotation
    • https://leise.ru/admin/ckfinder/userfiles/files/nogox.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77919243773.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/dakosumunaromaza.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/93992891356.pdfIn PDF document text
    • http://geraldinekilkelly.ie/28997745563.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/49814757314.pdfIn PDF document text
    • https://inijariku.ugdherbal.com/ckfinder/userfiles/files/60289670290.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/joneposizusa.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/gazutalefodibesazeda.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/setukukunetevowusigobileb.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zurivegumifoboberadife.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/mejem.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/89239802412.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/68819243052.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/68291204888.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161426b6b63c7f---87664303444.pdfIn PDF document text
    • http://fkhd.cz/data/img/zidapanorir.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/binisumojafujebi.pdfIn PDF document text
    • http://tulga.ru/editor/files/9303640590.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/zuvazikewupa.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/15485405599.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/vugijibirejufezapefi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2c1c34366---negoxuxugiferuposini.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337024ce31a---87269081632.pdfIn PDF document text
    • http://normel.org/files/upload/file/52301209898.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150d07e2eb4b---76511610344.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/89247318945.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_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3D 15888 bytes
SHA-256: 4ab57d68f3725ea9175b8ca6ddd6875c667e9ea64410cc17db987cbbf345eccb
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 11100 bytes
SHA-256: 6d2816c420cdda30a3fde0b03ed77e6ab5422c46157d780621a727680d2a11e2

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