Malicious PDF — malware analysis report

Static analysis result for SHA-256 210bcc66d8ec9202…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 17:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e499f1640f25e98e8c175966aa8ba07b SHA-1: 802da7a6f2ddf91eb82ebbabd97c0d9011821314 SHA-256: 210bcc66d8ec920286fe82732a481a809dd384f78ace309d02606fc9cbf97fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=gluten+free+dessert+recipes+pdf PDF link annotation
    • http://www.alex-vasilkov.ru/images/wisdom/file/78204083054.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b7237cba---87275448368.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/51508373084.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bilavufivuzuna.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k72eua444dqogiv6f1rdr33i24/desipikinowiwojuwagawej.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/xepijunofowiw.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/52108535693.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff510c438---ruvabejibukuxolazawago.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xuxavidizobor.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086135bee2b5---viwovimokapem.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/57156466317.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sus4e5l5abikputlk9ta75rj47/tewapizufasa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611643068676c---6416780042.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/at3ursh2dvp2qegr5injbm4496/kakux.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/84227105729.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bf2f5e3bf15c2d89f611b1381f1e1805/mosajo.pdfIn PDF document text
    • http://saptpadi.com/files/file/65900365208.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/mixige.pdfIn PDF document text
    • http://www.centralperdana.com/file/ziwuvaxudepudakunuzuni.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/fejejuvabavowegelibowa.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210624043436.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/10968846911.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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 15832 bytes
SHA-256: 5cad6451a6929033b554c936126f989a302a88e96f47142c61a3350ac60cce0d
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10468 bytes
SHA-256: 84358e48b0bbe07194130fcdb1cd8c8b0a2b7f3985f83c1c9c10e1972358ae85
font_02_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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