Malicious PDF — malware analysis report

Static analysis result for SHA-256 533cef59dafccf95…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 22:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19d65b1aff10f399c9ae117a03591b03 SHA-1: 1804715e9ad0f7948e450f35c5ffe77aa8e91c0b SHA-256: 533cef59dafccf958bd7576dd2265d4a32eaf111f87c638a483f06a5ae785fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=10k+rmb+to+usd PDF link annotation
    • http://stjconsulting.it/userfiles/files/zurapagarigo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vt2rfntr9nruif0l13ca0td7u1/55485734702.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t2koo7i8uciupm3nojtsm0pm23/vevasorebokabujuke.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/40390199727.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/klchg6nidl6dgb4dsfcj5g4991/7930128458.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6baa663a7a2e2610dfce7e75d5671655/ruvewagozovena.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/94445651249.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/zapovevamovigevunow.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd3e7e0a2---70786024639.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084023cbd71d---jokalemegovobuxedolala.pdfIn PDF document text
    • http://yilip.net/userData/board/file/vibamififamotogerawak.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kekilabino.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88a3b4981---lofatelusak.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b1b9894c---56242232672.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tumawibinolosejalodake.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fd942c1e2---dekipupofemagam.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/dugupivatatebuvifan.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/37619702690.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c799376db3---xaporijupidujaxilax.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p6io4p9oqrtqsjf7i13nntdf5u/wivuzatapewixinilezo.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30465234592.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160969d0c272f4---kiximetofeguzogetiduzi.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10280 bytes
SHA-256: cb0b0110b1073c85df11bde100d4821fc6e69c89b63f4ffdedb9a3f2d07251b4
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 16220 bytes
SHA-256: 12997cf04278b798a38c9f9e4d6428162e7fa976abb0af71203038076c83ff3f

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