Malicious PDF — malware analysis report

Static analysis result for SHA-256 1224c2429e590603…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 05:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97ef51495f7495adcec6246895817d74 SHA-1: 37efc8eb5a63ac8f1f06a2c283e57684873bdee6 SHA-256: 1224c2429e5906038141d7b5aa9a61da618796d2bb3e40304847c9083361891f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=descriptive+words+that+start+with+the+letter+o PDF link annotation
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3ef3fea9e07cb4c1b65e72d1005b0722/vipamabasupalojagosebe.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/wumesex.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772c4a9e29---zokatofoxajunutanusid.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/17953872548.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210916100322973405z40gkfwkmhne.pdfIn PDF document text
    • http://charivne.info/images/file/gejupanipinaxikot.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/59910748328.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/dekelibizusenavas.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/60685055238.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/dabilowowuxinivurev.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/soxikadixugunapobefedex.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/14658731777.pdfIn PDF document text
    • http://adveotec.com/img/file/44069014796.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/fezisasuvexowuxopisavi.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/73466526769.pdfIn PDF document text
    • http://wych123.com/upload/files/48859761765.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigaxumow.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/30d0ad32952eb2e21a346e77fbeeb12a/vetanubodufapodineguda.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/kulalamosedeturejugu.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/7405941743.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/zexemavaluzewibediga.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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 17168 bytes
SHA-256: 292bf1c6e8451ea59f3e46c9c9b4c5c650df1615d53fe3676a9fdcf4693359f4
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 10660 bytes
SHA-256: 75f50d8232ea3ac2fc863d649635cc1e3b668cf581bfc35712fc3de50ad74702

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