Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4bb1371bbeb832…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 05:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b83e7d4acce8971813a9b78d9148dfad SHA-1: f4fec18a6b6f7c679e23dfdcebb3592d646d44b8 SHA-256: 2b4bb1371bbeb83255362898cfd3f54ed8d48c1e0e005a6ff464a066d23188a7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.rpv-drachten.nl/files/file/96589247884.pdf In PDF document text
    • http://toonesk.com/upload/befakilif.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c67ddaf90c0038ed71a297071cf526a6/70632155156.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/sapawelano.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c8ec921e5fb91576acfdc4112211f86f/23842151853.pdfIn PDF document text
    • http://renovator.cz/files/file/lejidejagi.pdfIn PDF document text
    • http://lucann.com/Upload/file/pawefafalijuzadeneli.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ceec31877a99d1df77aa62738dc7f59f/dekopiwi.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zadukizodewojom.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1r1ir29s0k7n46l6u6hsgd1grl/babami.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xolututefupe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4be981cc14---54518371719.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wuvatumuxidetog.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/67472194999.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/91840046272.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/gemobi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/49644603044.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/91b04cc09faf23e8b5fcb90ffdab1313/joxezemalaro.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bofarokob.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede7a42c022---nomigedasojunexi.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/17311329154.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/33240659788.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/t0einis2vvnhsn7bdo1v9u4jho/lenajabofedomela.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/sogiguxudozenejidowub.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/zawixozarelu.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/95344476543.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/69607063423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=airborne+infectious+diseasesPDF 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_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 17448 bytes
SHA-256: 675ec5102a98e3d9636796fec6a64f66020c6846d49346a3e0e7ca1f6519a1b6
font_01_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 10644 bytes
SHA-256: e693230bb5e317658e1e3b7474275272bcc49bebf2bd4cefeabeaa23230b62a6
font_02_sfnt_off000146e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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