Malicious PDF — malware analysis report

Static analysis result for SHA-256 056f31e632a47435…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 06:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2c05675c0043ad195e004a84f618fa01 SHA-1: 69cff558ab27f85fee5850c8427e0561d285cfef SHA-256: 056f31e632a47435139364cabda135ee4e62bc4a85e8b4de55e34ef64a583014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=texas+dmv+odometer+disclosure+statement+form PDF link annotation
    • http://ed-web.cz/userfilesfile/61222179896.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce9e185db---wojukupo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071938e526b7---xenepinazagores.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/numupefabotavogubuj.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/114ee809e1b8b5a6caadd8ddcc6edc83/nimotovad.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/raputika.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c6b44309eb6031dafe17d5b00dff8e6c/55818286866.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/47807730085.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/tokerilozagivobifamak.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620979320.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/kigezuxekej.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/bivanerofakotakelugepog.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/27787042681.pdfIn PDF document text
    • http://santeh.md/img/files/40799416242.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8cae2a1aa990a69d8ce7751f017b7bc9/36939849063.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bd68b8364ac7762ac2effe9d7ea0a2a7/tisajepawotevepojox.pdfIn PDF document text
    • http://emaaravm.net/upload/files/todijaxebuta.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42205636679.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/welunig.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c028c0a5192---guluwawudepesowibe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8798ebb7c---totelofavujelalax.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097291d3a302---67949788839.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/44411749615.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/lukoxuta.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10868 bytes
SHA-256: 890abb11a4529cfbe116669e50441c891d885e2e3c68d650f9f0b71be975be04
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16668 bytes
SHA-256: 34e8e8187aca468f9db5663ffc508155ec21ccc85a99462774d08e875767c54c

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