Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84260e2236583c4…

MALICIOUS

PDF

199.4 KB Created: 2021-06-23 15:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 12dd845a29b6a0d6a1c2eb955e664ede SHA-1: 727ee4442649699b35abdadd7603f5bd3254552f SHA-256: c84260e2236583c41b67af74e7d8e3666f5b7850811a0f166fcad357f9ecab4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://bestbuyfromindia.com/userfiles/file/67588922278.pdf In PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87dc1ff54---tubalojojurekemewamazaba.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/asmh5j0ldtg34860b5lf255us5/zutilofomatipeludu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47936dc3c---vodelomirinonorate.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sevogomatufixena.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/parunotesakelufa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4fd16f6546416aed684ecbacc4c68772/wajomosefaje.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe905afc6e---tubatoti.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/15597521825.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/81672026304.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160714b22d2e9d---36636248004.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/vipupabidikowateru.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb67da32505---11559721181.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/2d518691ef44c1db3f66e35e2b9193a8/bekanojopazupo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb5d2d5354---9848602643.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/nazebozelofedugopikorowog.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/13103422301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cleopatra+a+life+pdf+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C810 4856 bytes
SHA-256: 4c4f1c767ba0b6218eb9b13232d479a7abd0f18ca2aa52bb495d92a410fd5c28
font_01_sfnt_off0002d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D8B4 19508 bytes
SHA-256: 42238ac8b8160ade72e01dbef2929b09e2b0e1e5fe0c65ddb4227b66cef9acc8

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