Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1ad65e4641c355…

MALICIOUS

PDF

77.2 KB Created: 2021-08-05 14:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07d3b1e8d6ac9a0c6d46ea2848847f3a SHA-1: 4065a24e5f63de8c52cb8b9f091bfc81c5a86ace SHA-256: 6c1ad65e4641c35522f5b98e664f7adba28ac61611ba4a15b7529e795750042a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=how+can+i+program+my+suddenlink+remote+to+my+tv PDF link annotation
    • http://www.vako.vn/app/webroot/uploads/files/90325517844.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcf41a234---85362704672.pdfIn PDF document text
    • http://www.toptehnik.si/images/rubikivub.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/wipisutebelixusup.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/56005406688.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/91554202116.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/66958774852.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/44128408730.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/9odmeqmtrat8ph1gro5ulrhgtk/piwojolexo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c937493c215---77777763751.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/99430058575.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/beb2155a92ead14673ca20b17dc3e742/gatolenuporizeji.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/sotovegojewokir.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/11379782273.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gixoxotuwosimanef.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/18752393206.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zigajoridopidewibiw.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9e69ce73ce43b202b3a18f45113ca37a/25232701655.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/fetofar.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/11246189180.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lirigesumitafejidevoto.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/kubenosufewa.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/71507647790.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/11kfvsqruuv2q0bcov870las7d/puvadomusorebu.pdfIn PDF document text
    • 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_off0000cb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 16132 bytes
SHA-256: 9835429615e7928c0a2b2ea686c92c7e9b88b6a5a13d181e872e74b98a893ec6
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 11308 bytes
SHA-256: 24fdd29df6b9b1f581e9e9b38e1f9fb1cb28f6cbe0ed7590be9a60bc542f8a69