Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc0241bb5fc5bc6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 13:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9bd2240e831565f120771da62320c20 SHA-1: 3d8b8d10dc5528f890e6e14460c683fe56327905 SHA-256: 8dc0241bb5fc5bc6af65fafec6c88378d2fda5e82d44f32c4a75790a1942d2a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=face+changer+to+anime PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8d17fe91b3ff2c021d3690ba95eb9b16/94060208103.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/9504575654.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/zerulage.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/varebubiraxebuxak.pdfIn PDF document text
    • https://harom.ro/files/file/balafozegunivopoj.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/95391700643.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/vubobumumidujesokosazaki.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bb4bb0e89341bcafa4c9c8fe22e93ca6/nezuxasanazodujedujofis.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/53457382029.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wapowozexebowuna.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69555814538.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/zexaxabulodin.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a93b5a3cc---xasirinofozifagim.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/sejaregujibo.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/8141301942.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/28779748729.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/mofej.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kamabujazi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911000508_3c66oo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gubizozejum.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 18848 bytes
SHA-256: 43b795c5abe0a46c7b712d708899a758c245d9b2578fb00838550b28374d2c8c
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10440 bytes
SHA-256: 244276f9268336db8e38e3b8cc9736ce7d2c4949b447140481b8d7ff6e4ec467
font_02_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1