Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6353699ce53aee0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 02:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29fef641a2202f5dbcad91a9752a2596 SHA-1: 6272170db59cb214272e3b143baf792ef9ac72ab SHA-256: d6353699ce53aee0e978e170135bfb18dd648ea6ce21b2147b341e7b2dc8041c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

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://nomylo.ru/uplcv?utm_term=graphic+novel+literary+devices PDF link annotation
    • https://amoslodge10.org/ckfinder/userfiles/files/xovog.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/it67853sem2s6bea2oe559t7un/20527008555.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/sufenuzutinunogezururemi.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/nasatajevulitivagi.pdfIn PDF document text
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/75122665632.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/3582698915.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/bevosidoporuvagedider.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/32167075973.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/pilowovodajo.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/80088585718.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/fimiwivenuzowubotiladed.pdfIn PDF document text
    • https://hinaweb.com/upload/file/zajafijixev.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/66486340286.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308f532366b---takofesavonuve.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392453a6818---fukogowutoratumo.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/29879314722.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/gebamelekevugivima.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/visironugu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/60770174860.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383ff5d8b60---85751363760.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/33284077976.pdfIn PDF document text
    • https://mattress-leader.com/media/55430875513.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/jepodikoje.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/8493665152.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 18232 bytes
SHA-256: f81d0720ace7da6a08f9d178dff5c25df6ffd1f04e76481c312aea572f8fa0c0
font_01_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 10832 bytes
SHA-256: 4de2b515415bc6ac3c6d91391192563c94c92de20c837301603abd48eef77423
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1