Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8fdfc239249d46…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 04:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5baff7e13a727af3ee42390c628c5a8 SHA-1: 67ba1da774083410c415ba1b2ca057f20fae229c SHA-256: df8fdfc239249d46b55d3ff7ceed4b72c89b9114f6ef3af058382eeedd6870f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, redirecting users to various domains, one of which is associated with a game hack lure. The presence of these links suggests the document is likely a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=sb+game+hack+mod+apk PDF link annotation
    • http://trips-in.com/ckupload/files/pabapojosesinoga.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479ab306de---65419399596.pdfIn PDF document text
    • https://ekransamara.ru/files/7913508830.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4904626413fea604a73ee06450d3048/50615185720.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/biwabosagejobelosuwumaje.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/fadarodirajotetiv.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5301edea9---32560752303.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5473b24be1756f3de3c0879ff44d1c9a/zagipixubukokelipapul.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/6994792972.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kinojiv.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/genejudegaxejeguwum.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0f981682---36656897904.pdfIn PDF document text
    • https://ultralloy.net/upload/files/49071589103.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/kamarababupakosepamota.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/sigelafiwimif.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fexujakosimudoxutepaf.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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 10660 bytes
SHA-256: 7f4601fb8d01144f5c3945ef7c7efc0a185e5f85019a7005e1dbe5511e937196
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 18076 bytes
SHA-256: 1b614ca343b550326867ad3789f4fdc657a6d58f229a174fd6cac3d8a39a9d54

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