Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fb0aa38c211a45…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 12:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce6a50a2a4f4b70b5e971755365653ea SHA-1: 2a6c544d995e4a15cd77ad85ab0d72535e2dc037 SHA-256: 26fb0aa38c211a453f6e60c1a2ddaa965dac892e45742e51678359075f2b9b29
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristics and URLs point to a pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=full+blood+count+results+interpretation+pdf PDF link annotation
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d4cc283b---jisitagomaked.pdfIn PDF document text
    • http://livestocktool.com/d/files/51174107606.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b454d2b8e30---10640396363.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/cba60a1ad24ef15dbdb09344582c8ea8/43303445294.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/788350293.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zunosanenok.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a071763345---fazewuzob.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210716194253_5l61xw.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744638c29fc---vazugiropuvidararuke.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd57232ad---85318182300.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05a60c1e4431aa4e65889dbca1209c47/87179120395.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/zigufubisiniwomaro.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/90810101936.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1491f7cca1c62d73334f92f0fb977900/98609670899.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xoxoxikiba.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62746430868.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/72462575124.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/pedusoxosevasop.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/ribuwapesanitevomuviz.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1gvjh4pk9pnfohfcjbl3sbd2bl/nesuzamulemajejino.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/57521508967.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/bulokajadedidogonar.pdfIn PDF document text
    • https://oferta.lt/i/File/61167003462.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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16600 bytes
SHA-256: 19674923553f1803b7dce06ac9a808a6f56bb7bd631203d79079dd5b665da714
font_01_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 10832 bytes
SHA-256: 68ee71353d39d3c78eecd1dec40f00dcf7a31880ebe5b26bffd1b292d38976a4

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