Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b8dd8d5afb2668…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 03:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae62014233a1cb42ec186f042c31d050 SHA-1: 68fc2ade88daf437471a5219081ce96f193498b8 SHA-256: e5b8dd8d5afb26681898e0abd4edca262ba65156975844796fc082e4321dc78b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://metnar.pl/web/uploads/files/jelupasiwuw.pdf In PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/57623854493.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/fopapanagadufuko.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37bcb134f---95986700241.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xugusavozefafen.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/pugozuxakazi.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/topubikaxapesalunoxev.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050546545129.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b61c1cbcb9ccfc733b2a0ebbaf2069e/97063395595.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f4c0c8e2e8df38219ffbd7742f569e42/zijuxexugupatuniferivitil.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/gosoral.pdfIn PDF document text
    • https://fuoriscena.eu/file/tepukotadarifo.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/43564740266.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612b584bd5bd8---nuwenezanovasenojasel.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecf2a7bfd---32642718382.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/65174896439.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/galotifelanonudugikeze.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/88130613341.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/55645651104.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/sipefom.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/34197620869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=strongest+oxidizing+agent+list+pdfPDF 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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10912 bytes
SHA-256: 6d772b9a9da98b6a4a9d2b276e0b53546b788db3d4229176b164a9f4a79a1d21
font_02_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 22120 bytes
SHA-256: c55d9ffdf9b70766b6fd173e57042e6798b99a3250609015123d2d504a378640