Malicious PDF — malware analysis report

Static analysis result for SHA-256 8297f6edcf9d7be7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 10:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 724b4ed691fc97b18dc432ebbff010e9 SHA-1: 224590effdc92dfc208985ad82d23a510d83818d SHA-256: 8297f6edcf9d7be7a13a140f4abe44d81a198b992a0272988ed40526b1233456
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://istanbularicilikfestivali.com/upload/ckfinder/files/rurifavewes.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/55133565120.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/rudesuderuwizuruzuge.pdfIn PDF document text
    • http://aquatherm-graz.at/files/67260544515.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e5fd7c310a7c2282c0262e0557587cba/doxiwenub.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/wisex.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/55399265989.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/25137780503.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kejutafugupi.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/deroxufavedi.pdfIn PDF document text
    • http://proart.by/media/file/8348088549.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/81425456114.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/xomoxisapadila.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/85638021470.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/vetafiserazawonepabag.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c81be5d15---62871238650.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bagapozekekidopa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813fdd57dc---37466815242.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/38190765705.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/sojuzowureka.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/67724782560.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614157a1b0542---kobuxobafumakarurilij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nba2k19+apk+androidPDF 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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 17952 bytes
SHA-256: 5cce95f5dc9436217e64c1d51cca4c15eec35f81ad075247af9159191127c7a8
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10488 bytes
SHA-256: ccb88bee31591263029556f5a1258c28929ff2dc7f78370425a16f164a91eb09

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