Malicious PDF — malware analysis report

Static analysis result for SHA-256 3676b7fe9e6e4ff3…

MALICIOUS

PDF

77.2 KB Created: 2021-08-21 14:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81c8aac2a28580069137160e3df6a99a SHA-1: 599699029cfc89863d5542bf80d17695809d42fd SHA-256: 3676b7fe9e6e4ff36972d2d207a5e7229e5046fd5cf7d09cf36c9fa950776ce7
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting. These links are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://highendschmiede.de/highendfiles/file/senoziwomivok.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8d0c7531165008beee6692f32a98b449/lisiranipazirumovofowifon.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8e6583acfd782b4f71d4e4d6d84a20e1/17237411109.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22a3c7403---44959276861.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/36486186792.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/63241190814.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b450294751---15324245535.pdfIn PDF document text
    • http://beta-rc.com/upload/files/dilomokirilonofomegosex.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075160776e49---45109708060.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cf1da137---24527853568.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/50280732166.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/rakukakowitisimovobenu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfefb5e3f---55346890977.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/35422972444.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d554cf8a2d016e002f6595e324d744e6/27643813539.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/26300598255d36c39f6007fefebdac40/vepokiw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ea170d226---texobemux.pdfIn PDF document text
    • https://avenue102.com/uploads/file/sapuxaxunibupova.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e0c2089---31680692304.pdfIn PDF document text
    • http://teraval.cz/res/file/26792582994.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/121053c4e32e5e8e0c1d85f3fd0f4103/putozepaxogivonulokipejaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=who+is+the+real+project+zorgoPDF 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_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 16848 bytes
SHA-256: 2683b132633c127801c5d33c113ce0c6c50b86c56bf7d36e34ce76de592115b5
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10732 bytes
SHA-256: d5eb453c02a43cd79bbd01ba77fcb38b882c07bdc4da106727a794c4c2d7e3bc
font_02_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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