Malicious PDF — malware analysis report

Static analysis result for SHA-256 f737628225eec616…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 10:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0787aa33cc70fa5407deb41c472847a SHA-1: 214dee6ce9d613732fafe9dfe98e34dfcd9b1149 SHA-256: f737628225eec616c12f2e2e73fb6924a51985f211abd6c53759681a95aadb0e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it is designed to redirect users to malicious sites. The presence of numerous distinct hosts and links indicates a broad attempt at user redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161438db06c814---34840261407.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614821fd3aedb---pimofedur.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141944f20578---55283022018.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147463a064c8---31224507458.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/56207924556.pdfIn PDF document text
    • http://wuchem.com/upload/files/20379345741.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140103c7c3f7---porokuwoxefapusafoz.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jabanukexosavurejel.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/tewekemajofif.pdfIn PDF document text
    • http://upakuika.com/img/file/15676633377.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/532b54724af33556ec66c606fac265f6/71949175476.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27299096340.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70f12232f---mitixevuwaj.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kizelapisiwibujo.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/66446580710.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/57637586037.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/36122753908.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/zinuxogidurupo.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/47241654276.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/6520806899.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/sadimodosoxamopezigalija.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/16736458123.pdfIn PDF document text
    • http://horvathortho.hu/tmp/71775025560.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/57283602578.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/d8deiuvhekptbsi7p1gon01s6j/beneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+will+not+send+text+messagesPDF 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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10760 bytes
SHA-256: a61931c0b6b656626bb59723d07f854e50c86c7d7730642c8c4e526729e0cf11
font_02_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 18496 bytes
SHA-256: ac8704fb50b0499c0f4e24112abc0784f724f397235829782b39519ae7ec527a

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