Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd42ca4459d484eb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cd8affca39ef1e78cabfc9e3718deac SHA-1: a1687e496805c4f9e9e66bcf51ab71a0b1c27388 SHA-256: dd42ca4459d484ebad9c275329f5b70ac73765e90632ad8de8d6b17a8863fa9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. These links likely serve as a distribution mechanism for further malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161150a855a9e8---zavulitatuwarorosov.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878293e81b4---45936217178.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/mafewifisugutupuwube.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d464c94812919fa2dad6a43b31682bee/kopipurijan.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/subasolitegamanozetivaf.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/rituwanenimimorono.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/xegunaruwizukunumanot.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac29baba8c---dakanorim.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8aadc0d22---mawamoronizid.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/widiwelidaditediz.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/pawis.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/715dfa820c4efd3fb3756e04d8d367cd/46238570641.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/powijigo.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/17213901381.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7da84671ebb54cc55455cd193b31aeae/levisotelaji.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/68080084140.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5b723500---83572991421.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/82541496507.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/042708ab4344a3a2b9af6849ec96adcb/92227963677.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/duximixapitipixe.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/vagegivazujakedarirus.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nlumlnrmgqnlgpsjls3ef1ttc2/merikubego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=concept+of+business+research+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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 10944 bytes
SHA-256: e0132c06e5d64db288b5e9a8ebe66adbc81d07f1578107149a66d1b1ddd058e1
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 16872 bytes
SHA-256: 3e917293dfa75d1d8b8acb4fca5fa091496d4a5bd23ea83ed15150fb2171d064
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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