Malicious PDF — malware analysis report

Static analysis result for SHA-256 263f708e52770238…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 17:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9b546e3bb3d4a2f72428e86095fa40a SHA-1: 480fc34f2acb18a709f6855ea0c2105cc220f449 SHA-256: 263f708e52770238f1c1d02082501a91a7e8def4626c6182608728049dacb6b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=take+my+wife+putlocker PDF link annotation
    • https://music-group-store.com/upload/files/88216216525.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/vipupabomibajaxav.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/ponovun.pdfIn PDF document text
    • http://sciattella.net/images/file/zititole.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sowodi.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b305222dd---70878783293.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7c2a4c76313a877dced962d8e32625f8/rotolutaluworipuwepakin.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/teperisijebi.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/webuwanirekisawagogiwa.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tipoxajigezejos.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/lujagil.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/gepovajubewuv.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/20615804371.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/xinozufuxowijubim.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/kibajeba.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/funulomoku.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/40021140402.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/19596259314.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613751192a46b---64922388790.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wasitiru.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/855afeb856317b55e3dc521bab4ad095/pulofo.pdfIn PDF document text
    • http://logicamail.it/draft/media/69286029897.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132719e1a95d---xipisi.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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 16656 bytes
SHA-256: d508b15fbe4048cc6c5aafa271d6bb5e4df23987b4859a2e8e07b7abb7c9d8c1
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 10724 bytes
SHA-256: 230688ee25bf978dc23f3d43e786cc557e82edd7e9377b9b6255832128aa71f4
font_02_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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