Malicious PDF — malware analysis report

Static analysis result for SHA-256 88738ff2bc6e05cf…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 19:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47acafa7696b931baae0506c09b6d3eb SHA-1: fb8c6d3d5448fb7ee76f471e8ad25e256000f05e SHA-256: 88738ff2bc6e05cfad0c6929aade208fcd3cd3dc42db31d390712fe7d5ad4420
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5296

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=human+evolution+timeline+pdf PDF link annotation
    • https://betenrealestate.com/sites/default/files/file/pazajupiwusi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/lulewolexajosedupok.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/xolevisomoj.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/jugexevasazobotuvejatezug.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pjrbc555vlb737iujph1jbv3t7/wadabadomuxafofo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/79837590107.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114c93535e44---54247736057.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/tadosilosudofovuxijisolo.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/tewagip.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ff213fb6---magidigiwamifora.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95175130193.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb0d21016---89891254740.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088792073e57---piwudonodazivosizemorom.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b588349bcdc---54180332190.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/redimetinep.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/botuduguwubudok.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/volikaparudugubuv.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sa74kdsj27q58ia0fiv7s3f2jg/dakemazumamepifupiza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pomazel.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jutenoremezofirovafiliset.pdfIn PDF document text
    • http://voijin.com/userfiles/files/nofedul.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/46652880222.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/gotipadonidefat.pdfIn 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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 10548 bytes
SHA-256: d5dd738d610c9b68db4b7fcbe9203358c239eee481691ffc1eeaa532bee081d3
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 17824 bytes
SHA-256: 3cca144d7a32eabf1e74fba7479845a9745796138797f65f09938f1563671436
font_02_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1