Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf9c8ce1ab6b49…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 05:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27397c36740c9865f6835efc1840c9d5 SHA-1: 1d9a73e3e4aeda47406e17059804bb84b8544930 SHA-256: c4bf9c8ce1ab6b495825a463336110dfc8952324ff687988dd27e3007060e9a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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=japanese+transitive+and+intransitive+verbs+list+pdf PDF link annotation
    • http://3e-recycling.ru/app/webroot/filesfiles/11907088997.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/55414078979.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gedokoxelabidujodo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/31181382318.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/79310713608.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/podabakenuzujerutelofo.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/nizul.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/76835030762.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/9573397505.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t114ueerpg3mco88ihjggkfqha/88671984652.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/49423463545.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/98707757551.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bd1eddbb68d05cfa8281b3a0cb8fa6dc/gaxipusibonuxafug.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160778a567dd32---kojaso.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce83ddace8---17338429767.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/18716253169.pdfIn PDF document text
    • http://tipiland.net/upload/file/7435030018.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/56987171965.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4345375208ai03cphjsmelcmn2/bisas.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kumajazakiwebogejug.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo61795a287aaj58thpq0q7ul1/jopolowef.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tizatalajatopav.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7e8f5923c3bc05b46c270c00d481e437/gasajuzubuputa.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/zojekifire.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/57212075612.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/61365695719.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/21174339673.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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 16556 bytes
SHA-256: 7289c949012775d27a1f32d98b146c1f4d3a2a69203eb56c75f4ff47f931c3a4
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 10568 bytes
SHA-256: 38e1ceda36c67e1e05e5f87bf6603e6132326e4824e645c25f81cca2f345adfc

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