Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a526c1c17e4ff95…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 05:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4a9d59b76d34c63c93227bdf88b84f53 SHA-1: a7db21dfc8e0c2ecc0cb8131adf443d80034bb12 SHA-256: 9a526c1c17e4ff9519900bb980afbc7f2cf2b39779a3215516a65928db5cfbb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains. Heuristics indicate these links are designed to exploit compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://inwebjor.ru/uplcv?utm_term=coffee+and+anxiety PDF link annotation
    • https://digireg.gr/upload/favematezezepujen.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/waxeropujapawe.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb47f53277683e48febecb8fd10fe0bd/17551691618.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/kobidobovuxim.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a923076ae8b---87858576677.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fedoritize.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b7e86d6e---ketatasawodala.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92387785040.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wudegol.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/83604052985.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210730201339.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202108210106512650.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d091e7943---nuzefuzewuberawopabo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/74055080846.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/312e1f53252bad6c678c9834c637f808/4336575453.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/36124053068.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/9066136417.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/22497133550.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/damoresesobamixebuxijis.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/35159944215.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/4878460672.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/14599753495.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f77d0082b70---wetexinibopabi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad117ebf4fb---mawaxezazubafa.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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 17504 bytes
SHA-256: de9b05ba164633956ab5d534b85add2bf2ad8da011ef52ac8e03dd786949e28b
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10280 bytes
SHA-256: f28567b28b2db67cc233e37e33f21e2801151d527ffc71c2c2c0428a38ab5656
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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