Malicious PDF — malware analysis report

Static analysis result for SHA-256 601d08dde925fe0b…

MALICIOUS

PDF

71.0 KB Created: 2021-10-01 10:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7c7ca746898d4dcb16533d4a26a57e4 SHA-1: b7fb75ca5e2e2f0ac6be144de150ea852d6e123f SHA-256: 601d08dde925fe0b4732ce989d6f47a0ad2840278bcd4764984b93110774124a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=power+bi+from+rookie+to+rockstar+pdf PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1733bae2657258c93e974bef060f82a/76019232406.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nuzupomedurowavezuzaj.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e719720caa1917ee3dfd724796723944/35238662398.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/tedarozukufedowitu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2f8ab082944c3401b7b05649ee968fcf/degukiwusararure.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/63329437940.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/torudin.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/gajobakun.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60ea8fc73---59635864032.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/fivaloririvane.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/16898237628.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nigedipimigopiri.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/34361265323.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/16217022080.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/xogefowara.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/70875290697.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109261822152288.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/60401651857.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/ranilabevafamerakar.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/lunaj.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/48888693358.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/10613117723.pdfIn PDF document text
    • http://rsst77.ru/upload/files/pilamarabiludo.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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16844 bytes
SHA-256: 985d1394f57ef79f58983334524d1853c247f073c702425b517e2696112848e9
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10952 bytes
SHA-256: f0d36f04ba3bf09abc6401c9842b8728a1c66cb807e4894083c97cc7c7bf5d18

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