Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb0b51a21d8185…

MALICIOUS

PDF

85.4 KB Created: 2021-08-09 01:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 176ab25009dc25558b712f4c30ae2935 SHA-1: 56b1b0c593222310f016f76a6ae374c559037819 SHA-256: 5ceb0b51a21d818507eae52e70a393baa5e13756f1a2c7ad8967878a9ce0fcfd
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=what+constitutes+attempted+robbery PDF link annotation
    • http://grhs1983.com/clients/72571/File/99302981556.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/46a90b4d3106ba614787826eedfafcf3/kufijizo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c452e35eb1a---xujoralipexagexu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e445c7878eb---59294599231.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815ee862484---83642460968.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/lasetifogisewiw.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/63538539728.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1a7098f9b72546834583cecd159084a0/56019608863.pdfIn PDF document text
    • http://rc-modeller.se/images/file///39312706728.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q39akv2l6reu8kh2o4inh6tkeu/54819209231.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895e4e3ad5---fubumevikisevurax.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ed373f86b92a6ea57111d912e6ffc904/21479512098.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d110d0db0d---bukokuwojemalen.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210618025035.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/26727177787.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082e831f3267---xebetasuxawegepa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nonubina.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c09d54ff46---28538043488.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b890d7b7a72---ponabaveguresip.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/82657482974.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/80288390434.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ddfc0f6004ac95ea9a0e78081993ce5f/xuvidukinof.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mofig.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210724_CD2CBFE09C4DF2EA.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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 17012 bytes
SHA-256: 2b700efb1a3f7f23885e7d17009b308dc9bccb4607ca97d3ef855224c4469ffc
font_01_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 11080 bytes
SHA-256: 9a7eace375ddee8739db6a45d448aab752387ef155339c866dce7e14805d7ae7
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1