Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d631882906c0c9d…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 05:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9e8c4b87543b7d11d3ceb485317426e1 SHA-1: 56eeba979d6b57b651beebc2d76caf71f76d2961 SHA-256: 9d631882906c0c9dfaab2f9ad402dfedafb238d068101c045127e1021b67d6ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, acting as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lure users to phishing or malware download sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=visiting+lecturer+meaning PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ed8de120---xovadifonubeva.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a22f872c4ccef243e0c7e1735206f536/varojewowebojug.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9774e941f8---93616884416.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9597d2a6---nobubuxunixosewulifu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a346f1b0c243387eb2658fd10aca979e/13109101507.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/98f48e084p5vljsi1ts02eijo9/95849053431.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c5f1cfa3---nonarusugarakigex.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/othartper7i55rir0uokahjij3/kaxutoruladetaso.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a962ae60d85---bezazubojetax.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/27204013803.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/bunomotuvejusadoxexa.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/41176660280.pdfIn PDF document text
    • https://adikketiga.com/contents//files/96914927740.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/48da3ec3fb73045cdab7c7ce2d6e215c/sukogenomevifenikisizave.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9a54e7573277c6236761701ce7ce3a76/vatezojefikiwozavebaf.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8669ecf8a23674344f8cd6ba9585fb11/fiwakapulasawuba.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/rubikomitotidagaxawir.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841cc8329f3---kafuta.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070571a0db91---16443993561.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68b456fdf---82502335462.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03e56d0c6a---19603492800.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zugixa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ce6f9292672ba8700969cbc502f551b3/51864497700.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xokopi.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/17407792836.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/rodavorutezosilutube.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10520 bytes
SHA-256: cacb0780b83b9880a8250ebac5dad2155a2d7fd848ba5840df02f1594ffad6f2
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 17264 bytes
SHA-256: f267fc34a2ec47edfd6ee8690da53534538c3292417548097cbea0c0470afa04
font_02_sfnt_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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