Malicious PDF — malware analysis report

Static analysis result for SHA-256 524f67d9f537f7d5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 06:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 662547df5530f7db6ab3297f3adf7713 SHA-1: fc7528a432f311dd1de836a8757977f182e0e377 SHA-256: 524f67d9f537f7d53fe18e31185d7e8c522632b36b3db5cbf432fdb0135d2cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3e7144c2e1eb331d8750dfcb863aac53/56839997266.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764e18bd269---33555710084.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cd137e1c---meruti.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/46580691997.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96537827530.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/57305038417.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/71183164370.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986edc30100---771113496.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/xavidud.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f4df3362---lorumarum.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rd36bfl9rkki54q0c55tu3o7br/wixonosanasan.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8308a61f4---panuzonixowezurigodamo.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/84252395557.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/vesonakepojaxelo.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/96606850012.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74df1e6d03---82453448024.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c75a2ce6c66e6af4bed70a8d89b7caa3/luxafozudex.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/83479409756.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s95gogjqa47ong7a9v26slqdi9/ravowibenagotabibuk.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/gawajapodowifesafuretane.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/d68267b6e6e02da29d9c70c3e913d3a1/newajekirezitil.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/wojigamorozesaropuki.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/gilumefapuwopolepoj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/68906852394.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/sunigil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+record+someone%27s+snap+without+them+knowingPDF 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 11216 bytes
SHA-256: d2a62311e3e7ca5de5678c2a4de90c2b4974373bdab420c9a458b92b0debbea0
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16756 bytes
SHA-256: bb495d88325ecaacd513e53fca4a81e2e05b87a71045e502e11cd1a0372f7730
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1