Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51f1f813f6c334c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 01:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf3fc704c604c67790df07d58edc3020 SHA-1: 7ac1ff8528f49735f0ff7e84b0fa43e4090e66c5 SHA-256: e51f1f813f6c334ce6a70813d5df8d16deac1022ca1b0cecf70c7652d3cdc241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure designed to trick users into downloading malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=hacksaw+ridge+download+torrent PDF link annotation
    • http://sevimticaret.net/userfiles/file/426919635.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/beviw.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/gimanirumitadagagedat.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/detufakavaluwawopebikiliz.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/77065226486.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/tutizemozadiwuges.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///66600266671.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/18472354366.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/812375033.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e893878936---86264271067.pdfIn PDF document text
    • https://5udua.com/contents/files/20047240989.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/553027f5f847ac724ae9f690cf95fd46/wuvanujig.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/gowubip.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6147B14E42CB4.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotajod.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/jexegej.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db217b80ce---wumulixejojilimalenex.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/77743545880.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/zevasokaxi.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ziposanajer.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911084637.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 18808 bytes
SHA-256: 28e3d9130a006ba94ff179b59329f6a4dd61cfd3f4ebeefff0cfe99558927e22
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 10712 bytes
SHA-256: e69c5e6900b11196276892d9dc9130693b12bab250c6fa917ef1fce24e22890d