Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9288e67b9f1aa17…

MALICIOUS

PDF

77.4 KB Created: 2021-08-26 07:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bf506ae112d722efe5d6e22dc33bdcd SHA-1: 8da28134bc2cfb1df701b7fe41e33182ac060724 SHA-256: c9288e67b9f1aa17383fdf47596239cd816ae90e3324d5eab50f8157e1aaca72
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://oddluzanie.net/userfiles/file/37297746048.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f4c92de4d---kozaroj.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/398aa2f096fe8911ebf7c7f1770a73ed/notimuxijujobodanurupo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66a183391---nibomonujikonavadevi.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/muzanuriterav.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/76979918726.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/86jav1gce8buofibqbmv5ujm1t/78562182856.pdfIn PDF document text
    • http://gtshotel.it/images/file/todalelopitelobarewufeza.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/51390289974.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607724e1ae081---noneximogubolonuzipobe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bb94da7a8---93346344683.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zoketobufubawe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/10105763466.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mi0rbfs00c4nmledr3q90q6mm/32105031738.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/65103611141.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/72098377429.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/91281629460.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/666tmso5ifr6t7ou7fv7m29ga2/juvarelarerafedidase.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-20/images/files/91329750784.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf9fa6217---30179673754.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dusenobas.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3b07f156---42514677604.pdfIn PDF document text
    • http://strap.sk/uploads/files/xufuwagetutorafebidutela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=transport+processes+and+separation+process+principlePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 10468 bytes
SHA-256: 11c0a2ae7292e536d80eadff103039b9d4e0bb4cb5ae46d5b3abe1edd5abe0e0
font_02_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 17352 bytes
SHA-256: 8b865455a589e8b21c7776d5c520fd2e0c32011186f753b03848a5c16f312428
font_03_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 15056 bytes
SHA-256: 66187bc265b2e40da266488fdb003abbc1a0f46c277bf41134fe407e1986fd2a

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