Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2615c3a148472d1…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 19:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f82130c3b2f806bde5d7238490b5967 SHA-1: 88994c8f203c87da083698a2d4d0b38a735158d0 SHA-256: d2615c3a148472d1bd977354ea15fc9b80383a2eb1a2dc84a610c40f8105b810
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://foto-preiss.at/upload_files/files/dezalipavutarufepisi.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160977a5c593cc---zazijopigup.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/292ad043bd535a2622d1cada64e842ff/67040192979.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d50f15356---foziruwuredomekufolidoses.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/budozamomozuzajolubar.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/seradofutetivuv.pdfIn PDF document text
    • http://teplospectr.ru/images/files/metevafifefik.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/54534082330.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mlvqtlppam76g18so4e85nuf15/43279714807.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/12736096104.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/tirunez.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/241753177734.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/mufiviborufafivulojivul.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/zivolujinaxona.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/benoramidixefajakuvaw.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/8429102824.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/95722228099.pdfIn PDF document text
    • http://jp-cable.com/d/files/90679972369.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/bapowuxizobedovaf.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xurewikokekosilasijin.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/35129099254.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/sutupikegaxozima.pdfIn PDF document text
    • http://allier-genealogie.org/File:/xapekozagebexegam.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/razevipun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=present+perfect+simple+exercises+intermediate+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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10764 bytes
SHA-256: 68d7ee33200d8dd588a4b649ae5d029534cd158ceea9d1d88da7bf5e4627d613
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 18276 bytes
SHA-256: 537420ec6dec9491ef7465c15f918fc2fd7607cd15cf0f78b23b194e001e553f
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1