Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe1ea4fe5c4cc88…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 22:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5951b77895ca48a6caebee3a6d6a34f3 SHA-1: 69d38525493ba43209cf50dc0ae4afc68f942a56 SHA-256: afe1ea4fe5c4cc88beb059800be5ef3ff30cc00ee29c830ff916a10c888fff7e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm hosted on a compromised WordPress site, with numerous embedded URLs pointing to potentially malicious content. The presence of multiple unknown URLs suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161207f463e871---2085107065.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/75190777032.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d1881fe14c11d5f6d4245921093dfcc9/75131119597.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/datew.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sozuledijujij.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xitog.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/62963839204.pdfIn PDF document text
    • http://babamoleskine.com/files/file/23744697387.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080603043173499.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/vipadodogi.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/kesose.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095426a3a5ad---38969297389.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4fa19416e793335cc9f2e85e9c05e031/91983373593.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/loxomilereda.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0c3cb6453207090b9a1b661a9f77c07d/wopexakupa.pdfIn PDF document text
    • https://naoshima-habitant.com/mugesabevodudoketubogef.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/22980015035.pdfIn PDF document text
    • http://seritour.com/rsm/files/fanugi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/82816350400.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/vefatuvifavenekedodojime.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5f43384d---kakujujetig.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/99659638784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=railway+recruitment+syllabus+2019+pdfPDF 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_off0000b6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 11608 bytes
SHA-256: d482e8e154d713a1cd0896aa6075ad7c0f70cba2d6dcfbc899c711be2818b4ea
font_01_sfnt_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 16180 bytes
SHA-256: 1a1d3c4dd45c8ffc550c18b0466b26740af3dfd7fe3d3cb3f3ed22bb8f1682f2
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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