Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf294d65070761e8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 07:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 756a9f78254f54d577e94da41fa9201d SHA-1: 39dd4fde159ecbbbd397ea89c315ab9ddab460a7 SHA-256: cf294d65070761e829b3186273e1d8902a4cc55296c725f83e94aca5e1879c0c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/kanajitukepatuler.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4dfaa4f4---tizefujid.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/juritofuvonos.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec59ef1309---95713831014.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/wajini.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b1b51862---simegogemidetuwasanufeza.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/62397037838.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210901075057.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/86421686175.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zezerifusujidakikav.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bc729a68---pudaletezuwiv.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/82901170059.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/83464806648.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3126f142c0f78da1b7e537a9a1eff05/powowetub.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8584959345.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_FC90A4001FE68260.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/20074330051.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/47984710826.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/mukewajemefenurimariko.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/givegizokovepetigajeno.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/33040233563.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/nexaluxogebitavaji.pdfIn PDF document text
    • https://tempegaring.com/contents/files/ninosewo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42a0b00e4---jeribulafo.pdfIn PDF document text
    • https://tch.lu/files/files/84232532011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=simple+present+tense+rules+pdfPDF 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_off0000b987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB987 10552 bytes
SHA-256: 36e65ec21a81e93c1671aaa43bfa0d76d62c304be6e129d66f1b217f6a3e69a0
font_01_sfnt_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 15588 bytes
SHA-256: 03e10b2e35409c584a9292e87d395b544d843f91c488a66ff638abcbe1349ae0
font_02_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1