Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a499316815b981a…

MALICIOUS

PDF

84.7 KB Created: 2021-06-13 09:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8fee239265fbac55018f6adfa342960c SHA-1: 174adfd4a66aa0fbaab8b89e9db3b335ce9b8ab5 SHA-256: 8a499316815b981a0bf9eddeb03a031b349f0e6b6a3f423a61df18fcbc4879bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=sat+math+sample+questions+pdf PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0225e072b9091e0e4fb02efa575d4a33/wutap.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92cd7d7f88---86942508963.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/jokudobidemakevuwoz.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/rekezegaluvaxegevub.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zivupotobimuxilawiz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nesosorosake.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83344252453.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32e80e20---nidavelatugelara.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/42035002448.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/16qmml8q3qgn71c9dr6jlfanpn/49098646636.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/kumap.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jukidigilagukebakowedat.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5e863d507612c39a65331a3ad133d770/deduvete.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f1b1e4b61bca1628b056de7630f55a67/89069850740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 5412 bytes
SHA-256: 3b2cd2bf476abd93876fdcd5d38cc6cc61d2818a59511ed04abac65ce9cf8d53
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 11600 bytes
SHA-256: 07e56f75df8225394f47314df4e0f7a492d569e2ebdda5a4b0db4a332c9aa79b
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16076 bytes
SHA-256: 26ddd33c86de12c045729a51efb3d8435ba1515195a17a4aec020af2bb0c010d

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