Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f89e1e6b7e834c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 23:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1646c9c6691a7fa374ada5b39196a8b6 SHA-1: 389765a41d7cf25d6ddc2db518a2e367cceb0152 SHA-256: 58f89e1e6b7e834c7154311a95209ad7bffbbd513015e9bfacae617e04efd90c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=cut+off+drain+pdf PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d355413dbd---diworutalalijo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909efbe942---63004882962.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed06ce881f---54097680922.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/zejogeniwexiwetumut.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bidepenageja.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/fezajitiparudipamet.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lasajizipumeriwowasozonaj.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/majuzisadarovu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1cb9a3f10---lutamiwugafejenanusokebif.pdfIn PDF document text
    • https://xigmatek.com/upload/files/fexadepode.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f190b61e18---rerirupibuva.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/56636124774.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/n7kfs6goidbkh2tj7jalh7ia6k/39727672300.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/83021573059.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa8971f38e95681e1dd4fc41865c7780/danupefoduwujad.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jasimemawuguvatelulufido.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c70be0be056---bonejizede.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/30455337273.pdfIn PDF document text
    • http://jump360.co/upload/files/20210724140227.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jprv7rpi8pn1pfsjns87efc0g7/wifariranogelodus.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611d58ef655c9---miwidabikoxedot.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5tkovr0nas2ohf366788tmsoa/widupe.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 17136 bytes
SHA-256: 98b3ec2a54d3978267643239879d33d3ed49c165e09bea1831fecd060d94d514
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 10276 bytes
SHA-256: 189c08332ed53aefb4e108906773ac1fe0e7e0bdf3a027d667cb56b7036d6e57
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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