Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bf1d85e331ccad…

MALICIOUS

PDF

83.4 KB Created: 2021-07-09 21:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d36482bebfdda76774dc3983ce495f11 SHA-1: e0eacd8b94ed53b5f8d63913fe516ba2c9ec22ac SHA-256: c7bf1d85e331ccad7c77163c155c2b2a173d1ad7cfc7dd85a42163c40f5dad9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload directories suggests an attempt to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=have+been+synonym PDF link annotation
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/fukalifotovetojukesow.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d99d445a0---suvux.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/pewodowutoxososegorusawa.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/41794535588.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad40747ccd2---89032559445.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/62c4f6f98a8b28d6c33bdab2ed682017/26551433804.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/a04erfnkrfr01p8q83nbru4ibk/sodawarudepon.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85fd923b2---dejusifojesesa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160920634b88ce---kobatoli.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9282dfdbf---wogenoferatinimonox.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5924167089---46803181663.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1621202718427.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jid3a86ibcrtuk9rnfs7bioeno/36631770060.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829d500119---gapazakupelirevo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78528849588.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/276049f10052ccf8c6d6c22dc59e95fd/96389510625.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/14296923724.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/93373920378.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/lomap.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c242faf3fd6---51579501068.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/51720203073.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc9b1c308---1535409327.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff799a55e---59174110126.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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 17168 bytes
SHA-256: 54fc67f63cdb8e2aef93b622c1002d8b95165c3ddff5436e3db3b2691018a40e
font_01_sfnt_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 10244 bytes
SHA-256: 57c3e79d52ad0dc218ad0ade939137f32ee62d4cc855a03d763721eb53f22843
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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