Malicious PDF — malware analysis report

Static analysis result for SHA-256 4265f2977b3c7683…

MALICIOUS

PDF

81.3 KB Created: 2021-07-08 00:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09bc8c921a18d5238691c0a053f6e1c3 SHA-1: 825d6a2b2e79c8686ead7cdf7f3360a3f5682b89 SHA-256: 4265f2977b3c76830f8aaffdfec42f477e80ecc5d24d69c37fb420047348fdd4
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. Several heuristics indicate the PDF is designed to host a collection of links, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

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://laborke.ru/uplcv?utm_term=common+cold+disease PDF link annotation
    • http://www.kymkarajok.net/tiedostot/files/86182601762.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rujebusuxinunalupiwakasip.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/12399556059.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/19044322866.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/wumorazujupa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3536786617---kisorawulufelewizavina.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/aa5e1ad4760cf319105e7dc1eeb45cf5/tepekikarajokafal.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52930580954.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fisukagasuxewas.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3aac3fbbc---funopamamubeseje.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/33617491562.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/javokagaxoxasifagoma.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945f59b35---36923037016.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/pefuzumapoga.pdfIn PDF document text
    • http://eyetracking.pl/userfiles/file/43593099065.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kusanojepa.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e040a03c2c---7412697447.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/38242745360c004f790bb6.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/guliriwugovowixe.pdfIn PDF document text
    • http://zzweien.com/d/files/10613872103.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/saxetumupowufebeza.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/99965702241.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6eaedf2f---norere.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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10364 bytes
SHA-256: 7f8c12800f7741f63c62faa578134fa95d07710d751f846743a031f070df0b54
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 16560 bytes
SHA-256: 6a5de161af29a1b3a7c5dd4b489c2a27db81bdffdbfc649591ccb3504d6c88bc

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