Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc2b1d75b8995bb…

MALICIOUS

PDF

87.9 KB Created: 2021-06-07 20:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7dda87f26f5910d34eab4a4c909f42b2 SHA-1: d221a8a4bd2ecdc7e9fdf055d849f47a5c34d11e SHA-256: 9dc2b1d75b8995bbd1bc7f9a5e3f308f52a9afdf26440b94216dd90346cbec33
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=vw+transporter+t3+fiche+technique PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/09da45d2a4fba003df1aefdd41133a5f/forofitexapidojizidinel.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/reverisujavujapojoluli.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/lokozeduxisupololu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079caa1d00c6---busifeza.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/668b2cfb82f76f5e0f968854aff1dfad/jolorusivevepaxatap.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3a1597ea0f3c0e451d49606486c4db82/85727484589.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/dunebaloxumum.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/05164f2fc53ee3fc28765b4425dfb290/lelene.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a840236af5bf7460ffa83a29271a297e/tomaxuregigoxekomiwulu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/523eeddd9646093ea2adff375520d28f/zepapejekutejofokaberu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f75e72b7---38598536271.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607131ad8a78b---20519253956.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/4a537288ab08c6d47ffc39e67000c206/zajagiridegagavapugojezir.pdfIn PDF document text
    • https://promise-land.com/upload/file/jurupado.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62caec8a53---taxepoxivazasexu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0a0d99c7---jomalereku.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sqtcgbl5ciprqb9pmr7hv2fbf3/90168724106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 5420 bytes
SHA-256: 8d5d82bd1d98e19f7c311ddea45147d0611e475391a5dbcd8a744a13ead0aae5
font_01_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 12932 bytes
SHA-256: 4be59b84357a9840b3b50fcc947bfb74f13e4fef12a1ddd79cef9243aae26da7