Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6b5f447e0b2a4b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82ffae66dbd5608f2deb0019812bc9d6 SHA-1: 6d52a170c77288f1fa8670368585f62eb584014e SHA-256: fb6b5f447e0b2a4be1960313367175d878f4ff8c6f49cbf2070168ce9aa5ede7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs further supports the attack pattern of luring users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=1st+grade+reading+worksheet+printable PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa005099dc---14086373088.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f87f140e---29293807849.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/20818511883.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b518e4b73ba09676de1199665430f17/77581866723.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/34718161636.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/mitikaxo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/347d92d2e5558078c4d2ab7140f3971a/86069261498.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/voxusejalapipoxetikefo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e243260f8---88245907844.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/fujasosowumagapezoxow.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d638420cae---60226447902.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202107/1627081540.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qgbhmcp0ktpburde0dkgdldd8t/zepok.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/43015678402.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/85366292369.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tixeruridupujagewukufozup.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/b19608a9939dc21b8972f3e2a7ea6d72/73216379577.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6ff1f2948a071b59a353535c7da05a53/gogotitabufetejivevevog.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/41909175590.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/depawipulexojaraluzoje.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 10944 bytes
SHA-256: 450377b9d41e01e946cda0e7e1571019bb6b7169bd3b1e9e01f83a3c4308f182
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 17180 bytes
SHA-256: 4e18a4a78fb71bee445c1908ad27170aae0413874303d4be99107a0338d26879

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