Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc60599b8fc81660…

MALICIOUS

PDF

94.7 KB Created: 2021-07-22 10:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 701e2ca879da5d7f1948c40dc98f9131 SHA-1: 26f4a29ad3dec26d723628eefd7443b5ff5be231 SHA-256: fc60599b8fc816609febebb8c3f5f69e5f04cd8faa9400d386e4ddd8c3ad202d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a phishing or redirection attack.

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://efficientinfocomm.com/ckfinder/userfiles/files/kugivuwobif.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c9688836---wulojogumekamebirususimi.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/detivuzuzujenam.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/2577141444.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/74041171887.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fb52e077---zaxumidir.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/38125876899.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/23880891170.pdfIn PDF document text
    • http://allycatering.com/userfiles/wirod.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ek77oep035m8aokvvosia78pv2/wojegefulaworanonazasos.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaff779257---surotagazedatidutarif.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/18749037737.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/23950880668.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/93701236627.pdfIn PDF document text
    • http://hydrem.ru/images/file/gusopazefudidokigodexe.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/runidujegiwaratu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0638f88e---18499773782.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ejq8jngtio27uloi506253emi6/jirusugufilaxetijo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082fcae51624---xuvolofogedowezamalefo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wufidoradeve.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59ddea270e98709b1ef1153c61a43262/sigobunujow.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hrnhhuf4sclmrhknpmag6cmqrq/mevomewojidufakaliz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/98858472931.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/86570874647.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/16175878984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sexism+for+menPDF 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_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 10248 bytes
SHA-256: 9b09065d1bdab0c68997e77e6c851e5e098d55d68d14a314ecd28928aeecbee8
font_01_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 17676 bytes
SHA-256: 40ae0d092a3c97250b6a18c6171500069504395ef1beabb7ab8305a96c3a4da5
font_02_sfnt_off00015439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1