Malicious PDF — malware analysis report

Static analysis result for SHA-256 c604ec35886c4414…

MALICIOUS

PDF

62.3 KB Created: 2021-08-25 10:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4d314f72b8130e9ed9b5b961520b490c SHA-1: a7059fa011f7a44840297e060fc68bd4204e65d5 SHA-256: c604ec35886c4414b7e54a68ed3db715648c4e797d8b99d6d45a67dade04d3b8
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting it is part of a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. The file's primary function appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6844

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://wastran.ru/uplcv?utm_term=my+eileen+is+waiting+for+me PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ca51b1fb---37862428568.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/99690778285.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f17133eb2---vowikativazefimibowupopa.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6492707c131551e2d4640ef13cacf2c5/patit.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/88351856179.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/wekekadizim.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/750f6c61a807a5edac5bb09e5d76834d/fixinogijegulaxudi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/moxejajadow.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210623115314_x1xc96.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b5c2f4bbe2f4498384bc73d1cd9a3477/88354512547.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/kozumuj.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kmjlpvuckmelcp3n8g6j4h5vav/wixefelakaw.pdfIn PDF document text
    • http://cristalensi.com/public/File/71407353640.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/l3c8m20abd12e6a6ca2mp187h5/38512502820.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/bpute5dp7q47c5j3i916clg1r7/5639835725.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/954a45058eb17f311d3584427e41af46/robedabepirafuninofukudi.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/53441695753.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/93275978057.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/53792736020.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6fc4351---32289866714.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/51911676271.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3783ceecdd---najomabeziguvujejezu.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/939e8314d5e0a797a08fa2a9e764689a/42134911969.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/8181398647.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_off0000bc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 14884 bytes
SHA-256: ff5ec58f48ed2c6968a10b128ca4efcff0f5dd7c914fe70ae0341ac9ff180f55