Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b22f9a7290ee550…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 13:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4178e816e45b305ffcb878d23fa54a48 SHA-1: 1678425265c5e8bda8ebebd6b5c806bc825d1c1a SHA-256: 6b22f9a7290ee5509becee18bbed0e5c2f3e2ac393e7e61572472f2d04222298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b7333cedf7d---92398928253.pdf In PDF document text
    • http://poorclarescork.ie/images/rokesimulemawajizakax.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/bavaxin.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/80f74667c17da324af34419add713485/gorud.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54aba53567---fisetufakugow.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16c8fbe219---nunusavagiwe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd8806513---69029900833.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zujogazusadeve.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53281210819.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a10ee3047a84500691afb40fe2c212fa/26230005616.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b186aae7508---20327380375.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d800b2f5f665509df896e0b3e17ee4b1/75083154498.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/99729496701.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/runefuruvuxaxekudasureko.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fubadotu.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/ziwuwalikepirudas.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/57bf03796cbe44323cae6835824807dd/gomamimonajopanukiduf.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c50eb2fb---kalopa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3247359893---37774767412.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c933bb4e9---78610927525.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3iuub4hkge9927q2aphgbcocs2/36160389697.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ee5a59c8---89767015780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=introductory+paragraph+exercises+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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 15732 bytes
SHA-256: 9c323a3e489b82963e83e845765a56061e025819ca9dc0cf3b80bf72b653fbd8
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 11120 bytes
SHA-256: 486aa0d67cf89c41f2acabae7f226cc70cbcc923a95f23685ec9b730b8849e56
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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