Malicious PDF — malware analysis report

Static analysis result for SHA-256 a499ba5e7cf1045e…

MALICIOUS

PDF

111.3 KB Created: 2021-06-12 14:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 96c6e443ada5f63cfd73cdccc596748a SHA-1: 9eeffd490b571acbea9d27b3cda40ef4ed71efde SHA-256: a499ba5e7cf1045e0e49ec051b6327334f5c339e132e21a89d26cd3b75c312d2
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3787

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=romanticism+differs+from+classicism+how PDF link annotation
    • http://mytmbc.org/fckimage/file/kabaxugixibifafarobok.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3dff0ee849d2e9d81307e27c5b44eae8/61875609724.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078e47a76472---pixivomasopegubinopi.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/fumut.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2a3c42d5c1b7f9cc15c79afc39156929/17600731847.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/36575778275.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/73367871601.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499597c912---rotiluvewitasudupogin.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160842694d3ada---40359393900.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6159b8b0---57468728422.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zimuvat.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e01afef8---37218027536.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5540154fa---sajexajutezizaletolap.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/40994049033.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e397a08d88624ef99eea95ffae46233f/vexipopewesanifuwuli.pdfIn PDF document text
    • https://bem-sa.com/img/file/33854467968.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073703005b75---91510599899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 7000 bytes
SHA-256: c4055df0960568c9fe7516bf10d74b7eca9e6decca272c1ff1f25f8e7bfefc38
font_01_sfnt_off00014e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 4184 bytes
SHA-256: b319b8aa4456a5f0f8189e5fa8199c3576eb4e28ae9f726ce82e17a0ef2452da
font_02_sfnt_off00015cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF8 5360 bytes
SHA-256: 75c20ddb67a862693dd6b0a6ebe085e9c6f0f1fe13089131944d74e0b4b03735
font_03_sfnt_off00016f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F0F 9052 bytes
SHA-256: fbe079ea15c0c75406fece75377c1db2b92514e8ba0084bdb1f79f96992494bb
font_04_sfnt_off00018153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18153 2020 bytes
SHA-256: 8e984b93e3234ccf55113b115bb33e3bb028525f6874b161de1f0521464d2faa
font_05_sfnt_off00018af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF2 15360 bytes
SHA-256: db3b1656a0ce9abf0f97de4f075f8e9cfc0bfefa58afd4405717e996ff56093d

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