Malicious PDF — malware analysis report

Static analysis result for SHA-256 91af9255b3d810d8…

MALICIOUS

PDF

86.8 KB Created: 2021-08-06 11:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a56e23833a0b5f6b5ca69e12bca01e6 SHA-1: 239ea0b90feeac99dd1324764bfb21b8b0db2cb0 SHA-256: 91af9255b3d810d805015181f1c821b4adaa11ba9cfe4b92c5c49c50c81489b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bortran.com/upload/image/file/20210703060523.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/rebegopeb.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c54d0deb---18755141549.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e1800906a8b8452a64b1a33e730c8c30/lekupofuvuvugevofidi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jitosatabela.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/76713445700.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/jibaxaruvexakawop.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/72968a695fb059eca40cee55ad925380/40812669496.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1f59a2d3737603966ea175f6f08aefb7/88125277271.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cea0c6c55---gekaboveruluvofagapebof.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8176c9b78f375d546f6944bff1b4f651/95654426872.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/61671182782.pdfIn PDF document text
    • https://incense888.com/uploads//files/202108051135552125.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9d682ff417f90c7e10de37db65671571/80164804269.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/sarerubadigupefiwewawa.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b13em9202h1979pmueg273qfv3/fotuze.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/49542828756.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/7736022285.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/luwumadurav.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9d6ce129180d81e5bb70ccf3e8c05b8/77886603978.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fer0amn7qmd6d1bqdgrir4duck/45115691677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sci+fi+books+pdf+free+downloadPDF 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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 16420 bytes
SHA-256: 961fab0c9811f20561a86abb8949ed8a468842b71fe232bf8cbeed64fea51e9d
font_01_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10908 bytes
SHA-256: 5d36f597f7f22c5634b5abb6b99f96e88d11bdfdadebf137c91f3fc67ca189db
font_02_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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