Malicious PDF — malware analysis report

Static analysis result for SHA-256 e666047a60d5a2f1…

MALICIOUS

PDF

73.5 KB Created: 2021-07-17 07:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f2c92c2c7ac3a947145e3cc0b56ab30 SHA-1: e2b39e468eb226c93e4d4b976d889dd16d7598ea SHA-256: e666047a60d5a2f1132bf57e44531966291db1147e6de5dd08c02d8e861d003f
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various external sites, including those hosted on compromised WordPress installations. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7940

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://alice-immo.com/userfiles/file/11942396994.pdf In PDF document text
    • https://migger.dk/userimages/file/29054768639.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kegowu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a0b74537c---46548225779.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8338492864---mimikanosuxojudiwuzulere.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51547b1f7---70031720107.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/liporolufoninizijaril.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/21423197316.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909d0f9ef39---lobomepagurelet.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/linerofujumuvamuzaniloxu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m9pc8572gtn506h7e4v51at067/67081239355.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8af44b54---kejamerezejavepukunibip.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1967907b712dc50502ed63b611bc8031/48490141445.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ab4443bec09b37715bee57fe629ed6b/kitejiwirumejenizezaser.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/93173966508.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef5b0b6c1---5632091718.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c1e210ec1153c6db9d7322778d06d0a5/82888031869.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/56654327396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=heat+death+of+the+universe+short+storyPDF link annotation
    • 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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10676 bytes
SHA-256: aaf968c581b79067b3cd3f0ed8e479d6342d85dee599820287795258e5528738
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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