Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd74271fc15cb39…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 04:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04e90759e316fe00b2b6c249fdebfaf7 SHA-1: a93b3b64ca4b166bec99b1f32293c94d3b87b123 SHA-256: 1cd74271fc15cb390302e5b1b2f4dcabf20e43b4f5152032256b145dc9bfef05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload directories. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm attempts to obscure the final destination. The presence of multiple URLs hosted on distinct, potentially disposable domains suggests an effort to evade detection and distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80011b980---45626595652.pdf In PDF document text
    • https://rhuyscampingcar.fr/images/files/mawugal.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/94587115802.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d349098229f---57214128773.pdfIn PDF document text
    • http://caythuocnam.org/images/files/towukalozivu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/41641113010.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee55bb0f55d---24548583590.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3599369202---19330856152.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jejawidoxawojiwelifamop.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0541ac42b04e7ba10b3e8c041a93bd1e/dakumiguxubakixiwobaxa.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/jomuvekazojifutitewujiva.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/feraki.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/52002026.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dofaxoduwarutitidiramegex.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/51008501852.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210626_022021.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210618_909B30E73EA2EC8F.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/47707254168.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5d9d8a6f---66775903345.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/12319726704.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/xifidiwoxurapefebixeva.pdfIn PDF document text
    • http://bscartridge.com/pic/zigodamisaxebuxibebenese.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb2f11afc---73730551488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=condicional+en+frances+ejercicios+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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 19800 bytes
SHA-256: d9a7711836a0b6192ebf8c9e4fa55f1d6eadb2bb5309298dc15804ee2be9b93d
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10676 bytes
SHA-256: 41ea5fc32ceccfb81cd59e2c6815bc6d2041c24da0610972d4f171e57e51b32d
font_02_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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