Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e35fa763d140b0…

MALICIOUS

PDF

91.3 KB Created: 2021-09-12 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33ce2bf91a56da8d4a9a1365d07fc08b SHA-1: 52f5494518ec9c73eff05222c41df015134c3120 SHA-256: 77e35fa763d140b0fd6527262dcf20381396911c9fb06f39954746fb04bcdc49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lokalsport.no/userfiles/file/54813245434.pdf In PDF document text
    • http://www.hgekc.com/media/userfiles/file/sonibidugo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138424cb4a29---92789088692.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d461655016---butesumu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090106043073.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sawatamidotalujojozujo.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/puzovivupixojalisefekap.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/55386454453.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/pupalukewusogozepidule.pdfIn PDF document text
    • http://fourfoods.com/images/files/82551652078.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/ripawuletozolapupufosufe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2b3ecf184---3531554474.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/3005274636.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1dca709d---bodazekagavebazaduxani.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/89371006697.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/51865517443.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-4/20210904213341378420.pdfIn PDF document text
    • https://fong-cai.com/upload/files/migudixijakusa.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/bututu.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/88167650261.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/wijotutonosizidoz.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/dedodetokekajezupa.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wobavalofepobimujubuge.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/50256467955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kali+linux+nexus+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 10112 bytes
SHA-256: c09c54d9fe59d7dfb75d830d9ed656d98773556e25505202b46338ae8cafb464
font_03_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 22008 bytes
SHA-256: b802999140156c2baa003d8967688489fb797aa2481981722214ce09a7ff0f36

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