Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb3898dc4f8f0c8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 01:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b12633d7a486a80b481c0852cc8ab15 SHA-1: da0174887fdb6a6460e1c5300e02ad6c7cc82d87 SHA-256: 8fb3898dc4f8f0c849ed431716bf5c47961158536c240704d5590083c3cb0e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'uk+work+visa+application+form+pdf' in the query parameter indicates a phishing lure, likely attempting to trick users into downloading malware under the guise of an official document. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=uk+work+visa+application+form+pdf PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9f5616e197eaa3b0cef1a02a50345cd6/32551977063.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/2906661718.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/davawovoru.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p9pl4ao5kggrgomvq0mhu1pi12/tukerupajonik.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/42059489962.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/29088bc150a2bdd7193ce5c46715b27a/ronebesipanibu.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/61423296343.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/20526358325.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-2/20210702030449794864.pdfIn PDF document text
    • http://terrietanaka.com/library/files/dodonel.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0ef3c8d40---wowewetebasinagobud.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/parexupetafojaterajez.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/milibexaponowefi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad641b79f---koxaxurob.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d950b6056d---23082563147.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9d899291d060d18e8c7d7d03415d0fa5/64545280717.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tppa0kiiv0o5448k14u968mek7/75138006292.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/86d0904e9f1e26471ec85b6760869e49/86743480489.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/muxebuvuvurij.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/72098417861.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635a96f51---zajid.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/xazulabosogemomukajajibo.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/jekixefudejibafabuninuxuf.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/42511946313.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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 10900 bytes
SHA-256: 5133aa8b9ae2324b6b6d47997f51052a2e62418542ac3037d16093eadf410a17
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16400 bytes
SHA-256: 1b8c8a76c7fd727659c61449a39583012c48887298bf6769a39c162a6287d359

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