Malicious PDF — malware analysis report

Static analysis result for SHA-256 79baae42ff8c750f…

MALICIOUS

PDF

117.6 KB Created: 2021-09-18 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8595782392e65dfdad0b48e526fae304 SHA-1: e1364b6b60aebd9b773fb8737bbf385646fd149b SHA-256: 79baae42ff8c750f816db3ccf797209a1c73953d2f728eca0dd89ee28fd6d594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=guru+granth+sahib+darpan+pdf PDF link annotation
    • https://philly.drinkpoint.com/uploads/files/72135947143.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/28938733973.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/64837289451.pdfIn PDF document text
    • http://standardamulet.com/files/files/kowurufilumoximizojofix.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/69179746543.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910190353.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49fb3cdd5---14962950052.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343ac0c7ff2---jivupezorijoworifazu.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/parafivoleg.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/gabewefes.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/bobomojibixilus.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/kevaz.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jalipumojifizigobadebaz.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/77177681980.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/8648038232.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304ccbcb8d2---kokasorep.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kiximatiw.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/gisemufosas.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614332c2524ac---69761891467.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/54091918714.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/44592890621.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_off00015e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5F 10760 bytes
SHA-256: a0ec20c0dc238ed598cefdae9f33dd5605dd1226ed92869b3fe585144afc2ee4
font_01_sfnt_off00017697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA9 23060 bytes
SHA-256: 0acb16a577b969dd6fa52a82040509a0f08c923f4676d13944fc136c57d37eb7