Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f7b0305bd875ec…

MALICIOUS

PDF

91.6 KB Created: 2021-10-08 14:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74f8c356ab2874966542600a2ae002dc SHA-1: 438d95ec5a64c26e6ba01e1f19f5e95df86b5ccd SHA-256: a9f7b0305bd875ec545a901e7590b824beb4d3187a6366cde25ca0745ffd01db
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to compromised or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content. The PDF structure and embedded links suggest a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4575

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=biblical+meaning+of+strife PDF link annotation
    • https://cemb.ca/upload/editor/file/66549416640.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/10/files/211006083322.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/71519332718.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/levilofigeguribepi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mugapajowaxovafe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16155db432f6c7---67559363062.pdfIn PDF document text
    • http://vecsecity.info/editor_up/robebimi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ab4qte55dka8joahcppp6p9r0a/20310749336.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/41164006471.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bd942214---wajovuvovonex.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/26529604582.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/wowuximurogovupujorizaw.pdfIn PDF document text
    • http://xsteelstock.com/d/files/wabezejakizo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/700142527.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/28536446186.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/4567684309.pdfIn PDF document text
    • http://lg-palette.com/upload/files/89307011341.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141676c886f5---60845913501.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/64663489409.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea7736ea3---70203043028.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/68628169888.pdfIn PDF document text
    • https://kham.vn/userfiles/file/bavukanipenerekofalanurut.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F1 10872 bytes
SHA-256: 34a464b94000fabc7d2c879d252af5020f41b85b1c65b99f787442cbefa7449e
font_01_sfnt_off0001401c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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