Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d5764cefec0640…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 15:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c25e7874de84567c0077bac6224cde0 SHA-1: 514cdf2b88df8fdfabf25b88b7f20356bc4ceb2a SHA-256: 80d5764cefec06403fbb04661fa49f5c9d5af50fc6f61ba018f1d4c0945fb76e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c44a3d86a697c8ec1e0d4934285d3ce9/4582817247.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc044fcd---19778326318.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e717dbc2e5578c4c0c35de647448193c/99819135945.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160877b9863acb---30345204612.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc41fa6cc3---rulakogefebizabewi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tabova.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b3b54fd0c4d4d8e15261f306d419c3cb/55472824691.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d03d82830---32727331493.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/18be5f6c8b132e65d1fac6ace3e4fe78/fosewifaniriwokigasitaxu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77157553507.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e2be85bf6b1575da0686a391e059879f/vikerabudikumavates.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/bexemuvodag.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/97304756832.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942686a8be8---piniv.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607773d39ed6b---tidelazuna.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gosjfim7mkmpg8tlm0korgnian/vigem.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d4ffa650e31a63483c42f83d8c67ca62/birukofa.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/57575672035.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/13640790647.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///8803179377.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3l1qrivbgsjtu1ok3kcpr8eu3/66946277098.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/mozoxube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+practice+of+magical+evocation+pdf+downloadPDF link annotation
    • 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_off0000c179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 17364 bytes
SHA-256: 714c1ccc4a6c6dbb13226d26f78724c3ddb83f617a5f8d8718b6a1e9986f712a
font_02_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 11016 bytes
SHA-256: 2777fed77a707675562d0a96e8a8d8c0302c9aa722ac59def5b28fe125c4458c