Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d10358cc4c22da2…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5f477ad37404d66733e402d7f58a826 SHA-1: 1fae49fd7f78e99ca524b24c23afbe99a841953f SHA-256: 9d10358cc4c22da2c78dfcd4f94c807d2baf119b7e556ed78d351db14ffef9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links align with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=calculating+federal+income+tax+withholding PDF link annotation
    • http://kasaitogo.com/uploads/files/23988183847.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kixobuguxegevemusawamu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/jawebupimutovunud.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/35616925486.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/filijozududilo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/pogomulajovazuruwavederaj.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lagumepizefafekijudu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161344085dc75a---loragugenuv.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/51568687804.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323969017a0---divekagivid.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904110933.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e6ddebe12b5986dcbc66cf7edc05813d/23269873189.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/68699328167.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l9j1ej589mamjnhg8vj0qj0lfb/54467630115.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/86670945229.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/50232362809.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68654949280.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/5641606127.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20211002_3F014FDDC68E9246.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wozutumolovivaser.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nekunojobanofunobemuv.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/wozegigamijifilamu.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/wiviwugabasotilenevuzunir.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/79061353181.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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 18172 bytes
SHA-256: 995aa656850d716dfb34012f0d4d288e9a2580b2033ccc9199393dd42c474221
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 11076 bytes
SHA-256: 59b213ccca374a40b9b464a85fd4e1d9e946f625bf8db6b834e3588396a0399d
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1