Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cf68725bae7204…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb0e065ad6295c735453a207e53d7ef6 SHA-1: 61ba7ae3b11bce9e51de8e16630485d5e7a6e354 SHA-256: a0cf68725bae7204acda11ac08906efaaa555a920526f71fd21bc3b1a5c6bc85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=minecraft+guide+to+redstone+pdf PDF link annotation
    • https://wsbtitan.com/images/file/23463530346.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zusivaxijilomopa.pdfIn PDF document text
    • https://sopkambing.com/contents/files/21760418250.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/71668531121.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/wogadobisivuvuzekewum.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/22461652388.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dr1ri77i706k9vrqhn6u7q5s4i/jukigutope.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd7e320ff---xuvebubagijogixejuz.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/48329458508.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/mafupujukoduva.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/92577508402.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/wanowamosuvunemifuteroda.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/85444135683.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/buxeduxogidezusufubopoliv.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1ae69dc7---64752347174.pdfIn PDF document text
    • http://okun.su/upload/file/gobaji.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/4451213888.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f04150398---17437794362.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/gepufikolubo.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zumavala.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34496702e---xawiragike.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/wimoxozizi.pdfIn PDF document text
    • http://gibisch.com/files/files/39823921306.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/wogebolekobazu.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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 10840 bytes
SHA-256: 5deee7910ac625c7c8871415f5c8f23546aa861af96c3fd4bff40dc1e4abd14f
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 15368 bytes
SHA-256: fa0be236c998c2d14b32c22c3c175820972c8a703e66daafce09396c774d3330

Open this report in the interactive analyzer, or submit your own file for analysis.