Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d64a8cee5cf31d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 23:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82ddd571998c87d8916585cf66f5d4db SHA-1: e5f48e313586e5526479a9c89dd62ea6bc625a07 SHA-256: 63d64a8cee5cf31d5eaadcd206ab585ddddff0979738c1684b5a283bdd4381a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an intent to distribute malicious content or conduct phishing operations through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sankaibearing.com/userfiles/files/83872741456.pdf In PDF document text
    • http://newtarrytowndeli.com/uploads/files/pekeposamozisib.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0cf6db8141cfa124ff8bb0477f6772e1/pukuxafuzodotumaz.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wabikazepipitevu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/28294971712.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2dacaa70fcc3d34393d4468ead05ec96/robabap.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/93678167651.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/89079605267.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/gisafatuxexefudow.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/43979511170.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16133811024ff0---43265399050.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/69087936376.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xapate.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/82542860891.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/64648694879.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/mifuzu.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/96566417574.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/46061980820.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/24642758887.pdfIn PDF document text
    • http://myesen.life/userfiles/file/22700571882.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jewulegilimonilazel.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/12420189471.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/43474083661.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/336950869.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/25801207623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=carl+sagan+contact+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7ad5b2325---xuveze.pdfIn PDF document text
    • 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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10600 bytes
SHA-256: 0d342ae4460b465f5f92f84be93b4a9f6ea3d4cb8ae22d65d39291aa64b5a367
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 18212 bytes
SHA-256: 041c208efc9d9cd0515c4844abd472afcaade21dad68c240abf4ee1d994a35f4

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