Malicious PDF — malware analysis report

Static analysis result for SHA-256 0742d75fc3398090…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 19:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b747c14814515a58bcf69a203fc5c773 SHA-1: bc07243b5c0ff4709d7f5484d488c80b8a1af862 SHA-256: 0742d75fc33980904c0eee3bc9eaad3ac70adcd092fd1b1baeaf3a09f7cbabc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://carmelocuritiba.com.br/ckfinder/userfiles/files/ruxixilukulimofusapef.pdf In PDF document text
    • https://rawoctane.com/uploads/file/21825803197.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/86257229733.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19761513618.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/guzibosokomevofunexuvab.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/77765221880.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/sisosakup.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/19795271917.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b39aae31---purofekazesagofivutewoxo.pdfIn PDF document text
    • http://tochalco.com/uploads/files/17975227767.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/63629174151.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140090bf1a53---24291840994.pdfIn PDF document text
    • http://1careglobal.com/upload/files/zamewafijufesefe.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/zuwirurepigalesowu.pdfIn PDF document text
    • https://kawanmto.org/contents/files/60579744126.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/tinubabom.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139deac4dfff---dodubisofenitid.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7718061634.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090116175368635.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hst2rt763me7n1ajd13rdnt062/52664233446.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c673ff1b---16404820639.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51e36938e---vojonizowewuv.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vekuwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=enterprise+application+examplesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10620 bytes
SHA-256: e6f2c9b647be1b0423ac9d9820e83e36a6013f24fba228d8b3c1f15b3e5dd2b1
font_02_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 17436 bytes
SHA-256: 232deddb5c3a4970b94042a99b00f559f18b2307d486b5863248fc7de59c2259

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