Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc099005f5d98dee…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 08:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6fa7ba78861371ce28c0f8d959107f9e SHA-1: d1b4092905516aa1c50bbb87c2f991185def71ff SHA-256: cc099005f5d98deeff21d96ec17f658cbb0d0200533a2d86426fdd15c8512b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the links and the overall structure indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3qr6pub4uffn79mlhrn2irs4b7/58889696514.pdf In PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60858953747.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/tojered.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/jofopudijox.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xomajifiwolitivaronegiz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/921fdc6272a0513d510f095ab05ecbf8/xefes.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97710054536.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/dinisozovubok.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/950463442.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/zilodenekizedazuwa.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/napil.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/35102964743.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f699c6a0da---nazuwepo.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210920194916.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161510a3ec7671---nasupidewatajojekajepulat.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/72410299539.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/59588742512.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/71232031164.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/92770310956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chats+similar+to+omeglePDF 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_off0000abca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABCA 16536 bytes
SHA-256: 6059bb93bcd5811def16382b1ba3ac755974dedee1f96b92a30fec58a3164364
font_01_sfnt_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10484 bytes
SHA-256: 2513c49dfdb4515907f915913efe0b594a2405f8813c26af6f6f643f275fc3d9