Malicious PDF — malware analysis report

Static analysis result for SHA-256 94541155e6ee6b6f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-07 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d12dfeb27455ff8f4870f57ee1d2f778 SHA-1: 8291ebab5ca669bae2f9ba080e1db9b9e585b17f SHA-256: 94541155e6ee6b6f6455204f0f618692c6cd06faaf54cfcbd94745e04d31bd3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a deceptive structure aimed at hosting or distributing further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c903a7e18f642724ed5df56ba71dd8d4/18545941306.pdf In PDF document text
    • http://cameradungphat.com/uploads/files/fumapazonotubewukox.pdfIn PDF document text
    • https://ivanamihic.com//files/zalinegifoxaxujejagaxav.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bbuuu40lqhk6dm2lmje5r8en97/fasilomifovobato.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a21cb640---51571959083.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0809a9e5d---nopabuxusepowivosabiwi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/pibokufewogonezanu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/30d190a9a750b2f7d633722c700856eb/kejajiwefakitupurewakunu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/82694451885.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae3ikfs89jv05ei0oll741vf88/zarewimigugilodedidizunu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/vobirot.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd648f292e---fuzipipazaj.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/begasuzomolom.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/muu3kjdjd80uf1u6g0385b48pj/68226155523.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/15907046588.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/61147504720.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/pozijaso.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdba179d1---26236792395.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210610141518.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/sulexuwo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f04d749e5---sejobu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/eenf4l26e81qgdqf9ephscct74/taxejumavumifilimunozib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=giovanni%27s+room+book+pdfPDF 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_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 18176 bytes
SHA-256: c54f8c4e3e9b67fa3a05cb2907140da36efd34eac5367730c41cbfdb9839d95d
font_02_sfnt_off00014cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD4 10752 bytes
SHA-256: 0e4ae1e2dcb399c46aac5561c4250c5abdc11167958fd42bb3108c986ae47e9a

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