Malicious PDF — malware analysis report

Static analysis result for SHA-256 2624a3f1c0d360ce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 03:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d30b9e138dbbed47b552a8c1cfa537b SHA-1: f2ace6a92f35011076a220802364b9ec0bc1bd43 SHA-256: 2624a3f1c0d360ceeb04498b4ebb8b6a71a47f1685d07c7fa862871d6f545472
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains external URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads. The embedded URLs suggest a phishing or SEO poisoning campaign, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/56434b9737ef4c529138dc5e13133cd3/zevonuwatilu.pdf In PDF document text
    • https://windscrm.net/files/file/39589354143.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nidupare.pdfPDF link annotation
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/87497133183.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/surijufo.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210901_161612.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631485686.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/soxojibuwanitovosovunon.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/naxagejugubikokikizewip.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wetas.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jamebemozoxemadixesamunud.pdfIn PDF document text
    • http://online-cycling.com/files/file/19209444526.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210903072721.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147cff53c670---pubatositizexifupati.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aedd7633a---88620947730.pdfIn PDF document text
    • https://kueapem.com/contents/files/lotumoziladiwukixulaxo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/joroz.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/filosinibijo.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/mititazajexatesapisa.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/padiwakodefuradam.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138acf931411---sawujazufuboba.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/90494683860.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/97493301382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+melacak+hp+android+lewat+imeiPDF 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10820 bytes
SHA-256: 0d5eb8b86890454e5cc43f675bc41c79a06266e4c773df636df6071f5bf1acb6
font_01_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 18628 bytes
SHA-256: 3ee3d72b981c9bf4cd07cd8e2e2cc99c1e6f7adbf661237999ce56ca01263345
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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