Malicious PDF — malware analysis report

Static analysis result for SHA-256 79874e3c433c060b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 07:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e55f861471e490826ffc79485985a5ea SHA-1: 5c8c47488b0eedb360a00fae386b8c3c1f489141 SHA-256: 79874e3c433c060b0719b614491919b2c46ef6f05f4be9d9f99682676ce9213e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic confirms the primary attack vector involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=lightroom+cc+unlocked+for+android PDF link annotation
    • http://protok.pro/upload/files/wijodulumo.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36360152710.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134e313f39d5---tabiropufenutekanotevepev.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/pilibefolerexipatikix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149300b8146d---39263158989.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/2431523105.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/60957892238.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/68433719958.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/22654354266.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/29440347157.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lerimuturopobebo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210911085232.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/50158448750.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/fojisodav.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/lezovunixasivar.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210922232844.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/greu0hb63gbo604br1h5sc7qi0/nipapitevuki.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/fodekamujoxuvo.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/diferiwilifavutarona.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/nekunixemunidekizasak.pdfIn PDF document text
    • http://budka39.ru/files/62320477136.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/jitexibedogelusewe.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210914162053247.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/94007318049.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 17488 bytes
SHA-256: 6a0f512eec4b967d497a7207f0b4bed9218af28b58256d066de1b7f8cab871da
font_01_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 10904 bytes
SHA-256: d8d01e8c695bbe757052c610205ab97bee71730d3e5e6c7692a6b74a4fcbe6c9
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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