Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42167b22325bf05…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 08:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7dba977ea862344d61758ce6121b2234 SHA-1: 9eb6ed659846fd07f5580b811298a9450a3915ac SHA-256: e42167b22325bf050cf6efed9861bb6a5f2f9a754ac58b945a918c1e839a1521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.dkmodels.net/ckfinder/userfiles/files/riziroxaxuxuwidesemudatiz.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c628c40a3---jugejof.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58938278115.pdfIn PDF document text
    • http://irths.com/upload_files/files/4410541473.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/sinariwizapujogadebiwisim.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910083004988796.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161417b2778e4c---25411966764.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/98337507118.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/75593801869.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/44578678968.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/kosolujiduxenibudigaj.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/66759167896.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/xeravagupuzepopewoxuxodob.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/vapagopeterif.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/77806557276.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd9610d27---572803290.pdfIn PDF document text
    • http://ave-france.com/pics/files/64218301578.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb557d315---jogimokijebifigizefoj.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/tinasaduba.pdfIn PDF document text
    • http://schubert-hh.de/image/file/57776701232.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/88770892517.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/30024868203.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/2144056306.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/muzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cucet+2021+application+formPDF 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_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 10896 bytes
SHA-256: 457c5965596e22ab0e3d22168c4d64dc9e08499137f244f2057191c611935dcc
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 17176 bytes
SHA-256: e306477624a4c6206d21c7ed0ed82b9458464a3bde3edd5c1b631b2b3f2f008d
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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