Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e9f27389de131c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 19:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a48f2d0511cb0b2aac1618f15322ac0 SHA-1: a83a46730ef6e9d1860acbccb9843992a7db60af SHA-256: f1e9f27389de131c06ee59e9310e6c0b4e6b3568d853d8551af02f6b992a3b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=sub+zero+movie+2021 PDF link annotation
    • http://crabandclaw.com/uploads/files/78158363407.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/50019003487.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/vatene.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/74015266956.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2unrk8kq1fris0j1pa5j9trh26/51657295690.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9fc0af0f---14849488697.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef2f78bb1---poroloxejenajaxemoke.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/1812068906.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/resutajeta.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/65193701647.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tuwumo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161453ce2e75da---71450209408.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/zikufimuduf.pdfIn PDF document text
    • http://belloverde.net/emailer/file/wozulupu.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/vivugegupunewobelidixod.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/purigifuseferi.pdfIn PDF document text
    • http://atya.eu/files/file/pefowineja.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090794533_858030053.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3ra9p5lufn6csga7c1344alpqb/bokozer.pdfIn PDF document text
    • http://wirheiraten.de/images/file/gamuxurifuwukatuzu.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nuvufagirin.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/lusebugezulomidekig.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/8261101713.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/3548197021.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10424 bytes
SHA-256: 0b5a07c0393f51bbe735388f530bc766a7175a43112d2ad0cfbff3e5f1330836
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 17304 bytes
SHA-256: 01eeb9d6e7ae81b4a9f66390175338ca2fd6a8a9ae903a2d1ee456f376e34b3e
font_02_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1