Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bed63138f9da1e…

MALICIOUS

PDF

76.0 KB Created: 2021-07-03 19:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3f7b4be682f4f9fbe2b357e946921e2 SHA-1: 6f144f4643e6a816487e72836884fc9a4ccad55b SHA-256: 73bed63138f9da1e7755f457a1471e7900b4d1b60f5fb59c3940daa872ff21a7
156 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 indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=free+word+templates+with+borders PDF link annotation
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/07f0e0348e01a3a25bacc18aa6afacf3/lanewotinonirakurabobe.pdfIn PDF document text
    • http://hkacca.com/userfiles/30298849491.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd233d5664a---jafuvovemurivimotabozora.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66e20833d---rukosojoladajigas.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tawokepijova.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qfb5ana7k7sji5e8lg8t8anul4/rizobumeguxulir.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/12198825938.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lr9c6m8h7rh3dor9hnvehpcljt/41439615165.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/16401287262.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/42541118723.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b47f5e78ebe---pajopigerasesugowu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/88215257651.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/t0p2jk987d7fj73hf3meh721pb/fawapux.pdfIn PDF document text
    • https://retta-bg.com/userfiles/waseguketi.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zosejavagunaliputuwopizep.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wijovamusefagasefinibizin.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c25a64fff---rubibotikabofujefewopoxe.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/goredutu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a055ea7cbc---kirupi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hqe680mev62mgivh1kvuijdapp/48939473528.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcffa955e0---nemimisa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/18ad8ebf3cc0f5b1c9adc97a10c9d703/jebinakarorasusud.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/suvubirajifonutoza.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 16428 bytes
SHA-256: 00bd6ec624f138697c3a1f0a0c004bb229dfcd74f9f1f9d20c18f0ae1612d17a
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10756 bytes
SHA-256: 6327b9e4ef5ae319204c0ee691ffdda62a4514fdc3265053f660c15559a01191

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