Malicious PDF — malware analysis report

Static analysis result for SHA-256 7901c7f11ff5c28d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 04:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c5dc657fe3d8342bd425aadc2e5de56 SHA-1: 7185f042ac6bf453d77a6d2d192e19f9ec623780 SHA-256: 7901c7f11ff5c28df037046113736c371681708599f92e367ca3e55f2a9f4811
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate it functions as a link farm and attempts to lure users with MFA or one-time code harvesting pretexts, often used to bypass gateway scanning by directing users to download password-protected archives. The embedded URLs suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://limberhurstgallery.com/imageuploads/file/tafibirime.pdf In PDF document text
    • http://odontoflash.eu/userfiles/files/1999367704.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/78203815181.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6a775af10246b3834271379cddf9b923/9862963879.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/71926994608.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonerijiperanugejodilofok.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/95217392940.pdfIn PDF document text
    • http://stroi-sistema.ru/img/75164734080.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafuwumugeforoge.pdfIn PDF document text
    • http://precisao.net/files/files/refakar.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edeb70c4a9---94714168359.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/babewakibekiditumut.pdfIn PDF document text
    • http://rotang.net/userfiles/file/4418579358.pdfIn PDF document text
    • http://mgrima.com/files/file/32726333823.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161334f5b8fdf1---85264085498.pdfIn PDF document text
    • http://mp-journal.com/media/file/tuxameniwuvatizuda.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/34782315360.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135195b776a5---vivatazalapipajipoviwo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7n3lmpavcnhghv6k6v6s5ti1g3/81092499024.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bimefegezorur.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97590714138.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/89138750028.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/3929073937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sms+attack+androidPDF 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_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 17736 bytes
SHA-256: 42f179414d56111f5bbe34c1ebb201964e6cfac290fb3a2765eaee6a49d4d3a1
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10520 bytes
SHA-256: 1082b6bc90071a6b1526141a2abe307253816e9597402774062efda8f3706abf

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