Malicious PDF — malware analysis report

Static analysis result for SHA-256 d025e9b36041ecca…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 10:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eca688c8292d82bd6d3487d5b838636 SHA-1: 9ddbab1cf9b03be24064149be1005bc515fe66a8 SHA-256: d025e9b36041eccac81f55c45f67dc8177a6d4a2b21f5456489b82f2c4cbce6e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of links to compromised CMS uploads suggests an attempt to leverage existing infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wsbtitan.com/images/file/wifufuxewesuzemubolurap.pdf In PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/vevomoxobokowad.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/79872202527.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/03363f3922c4fb08c39aba0425049557/sofevibu.pdfIn PDF document text
    • https://le27.fr/docs/file/42560363001.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fpjpfv9luq4j0qv4jchja3qvai/61361828631.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/31262951287.pdfIn PDF document text
    • http://rjt1.org/upload/files/78151024142.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/89085225271.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/ganagovabe.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/18863529774.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/16207045634.pdfIn PDF document text
    • http://balone.net/_upload/file///wokukipanel.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/peseburibafiriz.pdfIn PDF document text
    • https://t2sc.me/userfiles/8597123080.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/geputolumawuzabofad.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6af5122ff8---muzigagafedar.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611af297c38f8---20533062360.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd6c7d999---12977027172.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e73742b4---54925926313.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/45761917140.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608562aa883f6---98063233398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=panchayati+raj+system+pdf+in+malayalamPDF 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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 18272 bytes
SHA-256: 6f6f5e4305bb7d5a91c06b5c1adbe8515c4c4dfdb1b24d5fdf2033c8d79ae652
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 11008 bytes
SHA-256: 68612b1ef8da2be3668677769c6137a6dc11e459f8ca1186900fa240dd36040d
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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