Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6579fdfd3ab309c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 13:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c73ff47eeac85ad05fd0b13cd0d728b SHA-1: 43afefc1e58b4cbf88346aa0032c49f672c0d39f SHA-256: f6579fdfd3ab309c00cffe552751756fee5f4ca9508435165fc77a56c4d9290a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery intent. The presence of multiple external URIs and link farm heuristics supports a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://datenglagi.com/contents/files/gitelot.pdf In PDF document text
    • https://idroilektriki.gr/files/file/90959145826.pdfIn PDF document text
    • https://curvy.tw/upload/files/17021459309.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/97299893826.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba1510b9f---muvumolizage.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/63530011515.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wuboxekuridujimagulizug.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/tufitojavimexurejile.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sebixasabomi.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nopidukug.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/65898669283.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/nesexijosarusifalalujeje.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/12756248450.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/jesevodojiwekazosav.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210925174847_829545529.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/vuleto.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/39870877394.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/23996718862.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5662ab2e---turevub.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/17478861794.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/simifasore.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/jotadupukakamu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a498bdc3---65633713595.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614153342e4e2---76287658583.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6b8625ee---2109217289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=diamond+rush+android+downloadPDF link annotation
    • 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_off0000b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74C 17560 bytes
SHA-256: 8e9c9ae2991486b09f19d9404fd5102038efee406655752f563cc5bbb2b60bf8
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10468 bytes
SHA-256: 2b3520d8ec21ef873a3514f0741b35e76fe962ef5446e02d95b293e709c35b65

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