Malicious PDF — malware analysis report

Static analysis result for SHA-256 247a4d9ecc044e05…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 20:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cf4738d2fbcc6bf1ed210c6f222d9e5 SHA-1: 3a5b622d2ba4e4ff38498d47de9351791691d730 SHA-256: 247a4d9ecc044e051fc7977dc7f21725a5d1623e83a518161afe3f45522603f7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=ordering+and+comparing+numbers+year+6+worksheet PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607097006f28b---49524428120.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128bdd67267a---feloja.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/12d5b7fdc98fb1d9c7d3380370468aa9/2497249556.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v040054g5cqunnmk75d47c3mt7/55755983920.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/57634273125.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607890a50d6d9---xipili.pdfIn PDF document text
    • http://atek-ent.com/upload/file/podatozudat.pdfIn PDF document text
    • http://webursitet.org/Files/file/55091847073.pdfIn PDF document text
    • http://ucokampen.com/media/files/98746691621.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8cfd981d---bufevogijavugusawajazav.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/107482311761362ee41d4d5.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106300812472281.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/vumogasomevidoma.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210801045119_46275k.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/8969711681.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/99033223028.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/792b2bd077f56f2058978b3402c0c60c/76555397780.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wikarorozekada.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/zoderasajet.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f1ce83ab---87323527518.pdfIn PDF document text
    • https://mattress-leader.com/media/60170233722.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/nemunomegupuj.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/956f57139ffe394f62fb93aea4f4c731/70811193773.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/zunetij.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f282c388---kadeguduwamupugevuzek.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_off0000bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDA 11640 bytes
SHA-256: eaa54928ff41d2af25194f254f740aa29623f1e4883f89e5eec4c646aae75c9d
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16692 bytes
SHA-256: 170da147b61a320407fd6d1c6cdfba3d783d17a14695aa74fd4670872f9d5d3a

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