Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7f0272e3900b6a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 10:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4742f00f74ca755e2d88403855ed4be SHA-1: 0ee29bcb6d6e4c42f963b5342c9def259e11ce25 SHA-256: 1a7f0272e3900b6add0c3ae2315608326c7c3b9ad623611dad3b02c2055ee16a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The PDF structure and embedded URLs suggest an attempt to redirect users to external malicious content, likely for phishing or to download further payloads. No scripts were extracted, but the presence of multiple external links indicates a clear intent to direct the user away from the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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://medvor.ru/uplcv?utm_term=jointing+without+a+jointer PDF link annotation
    • http://rubensova16.cz/files/file/12650127078.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7c5210a6---85288817214.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/87354228284.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbb480603a---58375014781.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/25388804374.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/5293678548.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/94801754121.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c277a8bf1f---xalijerizinuxagi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925f88908d2---90765345220.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/kukuxoloma.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607635bdc20fc---zisabetikonitel.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/8b13942a6e2ca531cedb145b37157c57/vekonumiliwudetala.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1790643ca4aac873bfbba04cabd262a7/sebasusepugo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/83257168113.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/72215994418.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5fe9eee44---funamuxel.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd739fdb7---91455539630.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/rodawu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/kejilisebozu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609493c1b6e01---89632302840.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c25ce7ea---bunibowutebosonokoz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99a132d919---84947295632.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb74aa5164---13457323910.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_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 17820 bytes
SHA-256: fd060442a2fc56c076f2f0d3dde1d93dcc59b839115246ee1ad51928a750e5af
font_01_sfnt_off00013044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13044 10480 bytes
SHA-256: 1504e99b99af429725b21af5be91a645879a6f6f7aa80ad9c76d4ef7eca85912