Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e89da4f6fb6b0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ea0cc659c06361c166d98e6b6c32c06 SHA-1: 83e709144d69b381243fdc1a1d7d722ec9c96625 SHA-256: c85e89da4f6fb6b09088bc791f69a4d7b422ed0e312b1b56dca26ce7abf5ba4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=toyota+starlet+gt+turbo+workshop+manual PDF link annotation
    • http://bhartiyambeohari.in/userfiles/file/zipekikeda.pdfIn PDF document text
    • https://mfdesign.hu/files/file/91415682918.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/71204149984.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/53397148169.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/q69eo6sfa05l8iva15458o7g4t/kejigadezogagoluguw.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/99930368817.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/tetidibedik.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/59fb8886938d658aee41e15b3b661d10/63003385495.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/21599091183.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc59f1250---85590701095.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/20195529046.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd608206a0---45131675427.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6d518082---7130716602.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78076df7f---20571960353.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fupejovenilato.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/51753030789.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/11368100597.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/dinewibawekel.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/jeluvidufeb.pdfIn PDF document text
    • https://ysh.my/userfiles/file/63854466982.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/wogubowi.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/44907694448.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100565d1d977---tofifanodojema.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_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16528 bytes
SHA-256: 0b075864fd392ce48bfb1b8dd3d173d0f09c9431388823dbaf1f0d30a92e83b7
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 11104 bytes
SHA-256: d25aa7922e087eb31050b325a93a53401ded7fc3597374b628e099354d7cd896

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