Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ba81377ba521b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 14:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64ec017ba2d70a470ec1f12a4ed3e388 SHA-1: 903391cb6eedf36edd19ed5b93bf4b53a4c63bd5 SHA-256: cc8ba81377ba521be82935460278797090b7d343fddb5e3a9c864be67be6d707
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to redirect users to malicious content. The presence of numerous unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b084cc4ce5d---55324634563.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb0ed5563---33104713971.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/xakilaxowisijirabe.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/gavepudupumi.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/motozavopupefigokuzimave.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nirixarekivamevad.pdfIn PDF document text
    • https://dhesient.com/media/29273786695.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/relorikotejapul.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/479326117.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5aac213b2dafec8579a75997098d6e50/16270898181.pdfIn PDF document text
    • https://norservis.com/files/files/zakukekenukogelajigivi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dccf71c6898---tokanekoku.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2f3a2053---jaruxixamuxa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c788f3162---ditexen.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d15e71f3---lininusoxa.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/lidug.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f93d2109a9113e1bb0568653588ec42f/wepinorokokadezudoviru.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4337d8f8a2---95829357005.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/wejamebugiz.pdfIn PDF document text
    • http://carszana.com/image/upload/File/8428210070.pdfIn PDF document text
    • https://termoformat.md/img/files/felejuwuwilapudezajube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=heic+to+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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 16976 bytes
SHA-256: 9a35ffb801bbc87049c3255794a402d5d3b8dbb36b8e3df1fd9ec9a8f11d45c3
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 10024 bytes
SHA-256: 931ed806e818c2de2f9fd1ee14b278d72744f12823c7df24e47502b8d64d781f

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