Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176e67ba24e230a…

MALICIOUS

PDF

124.3 KB Created: 2021-07-03 05:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3e9bbdc7aa75fc5e71e3c1bf57a3480 SHA-1: 22faffd89f1108e3309c9cf28b69a665065623f5 SHA-256: 8176e67ba24e230acec8bf0ec5af8808adee3559e259cee001629e902735470e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to disguise malicious redirects. While no scripts were explicitly extracted, the PDF structure and link farm nature imply it's designed to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065e4a77c1---94020460553.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01e0d0547---xijapabuzojitefuna.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc0405dd7---7513330645.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160733839be082---sujezumitavokisifuk.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/zuwebumamigow.pdfIn PDF document text
    • http://learningkey.org/userfiles/52400547940.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a1294b1f---75644964791.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f0ad4477---49749098947.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/80337896200.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/287fe32f8dad4fd084a6a997601171c4/68913839639.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/90792280201.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/75010292450.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e3c34fbc40f6e3b970d8e8185ac46c20/93175515342.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/51c022f8b15bfaae86ef32de8267237d/21523080366.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/fedoxuzipopulinelewilu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860094077dd---79636950912.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c609567a1bf---sijeredaresalisiw.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/fonowavat.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad6d2db62---57599764011.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tes6ldmr92bkgqjtasjss9ehgi/47063582917.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4r5qddqk23l8b3iloo8onbg11u/12986112048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=haproxy+reference+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D9 10592 bytes
SHA-256: ce6a8fa2dc6b791376b0f4de795a3b564f9d6862b97ea453fea55e416f160a76
font_01_sfnt_off00019c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C04 18252 bytes
SHA-256: 5894bee560f1d1fd39be9096bf4cd51ea54172b603aed5a84b9ed6e043625d6f
font_02_sfnt_off0001cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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