Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7d49f8d6bb345…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 13:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f7f0839e22948366caf4b13bb06c670 SHA-1: c17fa74dfb9f9eef9348220de5a5fab4dd60d859 SHA-256: a4f7d49f8d6bb345046b1e8f8c7a9801634c6640c07d511ad48d9f6de6e64401
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 installations or disposable hosting. Heuristics indicate this is a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d6904f4e---fozutamusaduxewa.pdf In PDF document text
    • http://studiodugnani.it/userfiles/files/xubegolatujove.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kuxutebutofukomi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7077225992cab75a65d6b488da9e72c4/29508001901.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/58844733083.pdfIn PDF document text
    • http://atek-ent.com/upload/file/80708287978.pdfIn PDF document text
    • http://emeat.ru/var/files/11085832093.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/xatesefifusokak.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0982bb750---25979706800.pdfIn PDF document text
    • http://apcmagon.com/userfiles/gejawezaneteligat.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a519c559e---90475325047.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mukojukivenadokuza.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210718182129_1122348728.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/madulufozilumisuxuje.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/levozajavebebutuzojepewev.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90386f6dd---duvomob.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/60268526045.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/jesitazajikegufozufa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/emmhpgnna2ff84pdut93hapqca/38752565503.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2a85da1a---tavalodaxa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/60360893244.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/ruvowezolikaxikulerefovin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nordictrack+t6.7s+treadmill+manualPDF 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_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 17172 bytes
SHA-256: d4bc200e618002a08f611872639a2245b5bedbf128f0107140126fc17f96bce9
font_01_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 10984 bytes
SHA-256: d62fd5cc3109f0829755bd3be7e9301ee21a07eeac0330e8d1486eb68e03aac9
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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