Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff79eb53118f6d2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 03:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3f3f7eab568336852a58f736a358f81 SHA-1: cd48d990ed882f45853b672a76ebdd21b6abbae4 SHA-256: 5ff79eb53118f6d2a95cd603ef3606c554c802bd2e37338a0b94fccefd30167a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=testosterone+metabolism+pdf PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6ndb8r82cj13j0falec7s1h1u5/58086436469.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27672e1bd104e05ab4283027071bf7da/sofovojewabuwixidosafukex.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/30512169504.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6a8c5bbacd3453c7bd2e9fb0054a0be1/23634928468.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/812890255a694e5094daf84c4b82e28b/boxomux.pdfIn PDF document text
    • https://33mobility.net/uploads/files/78809504382.pdfIn PDF document text
    • https://ikima.fr/uploads/file/87344950321.pdfIn PDF document text
    • http://innotack.com/userfiles/files/69363454666.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/bonagotetakomakofuj.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/28020111309.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c275c0c1cc---40548084117.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/gajikawiwesitatepopibe.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/65671139228.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dec722be5---52002852490.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k5bfp7p0p72d24fb22pl6uv361/sivizuzivobaxiwexuvu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/41840687519.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/momidu.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kalafakoduxikabevem.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108010711198942.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rugusegilarixiweputazek.pdfIn PDF document text
    • http://biomehl.com/images/content/files/defexoto.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nijamonivus.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/78537295221.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/be12c8c7b6a6e1510f6fec5bff281213/goratubi.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 18660 bytes
SHA-256: 7c80dd73c4132080d04dc0b38947fffa1bff31588688641d65da5800a01cd428
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 10760 bytes
SHA-256: f765fcefc7d1e878fd1d547283cbf2594d53b96473b38e44d0965fe62efe0193

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