Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0581fce8bffa68b…

MALICIOUS

PDF

74.6 KB Created: 2021-10-01 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 765d9526a80012e1575c9440ed270792 SHA-1: afc23c6d3cc29f20c81f0b687b2ceac9216c8958 SHA-256: e0581fce8bffa68b7a749da636d1fa7db9c56dc6aa1301ac66669874ad02a2ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bluestandard.pl/ckfinder/userfiles/files/nixitulazuzomipiz.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1af505ed6603d4b22665015ee2a07971/nalamagoga.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/95768056120.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/49402461594.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tugekulugekuvifukejel.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/defazukedazuwajimaw.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/nirekuzekexirusujogat.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902142831688053.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/wopusanonejo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161345106138aa---mebanafibasewurefalex.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/numadekoxazaverarokewabiw.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/34572762524.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/12192442601.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/41217871255.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7bijdud1t93pn0jal1u49nadjs/61014720655.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/widiga.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/29021781557.pdfIn PDF document text
    • http://timebymtm.com/upload/files/84143238286.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/98062898786.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/faxuxekisisu.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wosuzinubobeg.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/6529064175.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qorsul4ka8gubiaptmo809hv6b/balifebavovumupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=volver+version+anterior+androidPDF link annotation
    • 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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 18260 bytes
SHA-256: a290a3e96eb588cd0b4b482539613042c63ed54fc0bd15ea4e079e7ead58a36d
font_02_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 10276 bytes
SHA-256: 2d74ca932fe9499c1d4a35d3473607c8774458959394b20340a69f11806f4915