Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5950a08c83330…

MALICIOUS

PDF

77.5 KB Created: 2021-07-05 12:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a58a028be0de02ff7873dee650db8ea SHA-1: b09afc4d0744a7eb72f6649017d4e6b5690bb903 SHA-256: 55f5950a08c833303f95b1d3533cc0ad0b65984371aa6d2b2013fc9e7e706dcf
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on compromised CMS upload storage further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7449

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://chcial.ru/uplcv?utm_term=swf+downloader+chrome+extension PDF link annotation
    • http://www.hangmandigital.com/files/file/26272448840.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/58546627535.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xaxabavin.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/5bfdc0d35a44346e455a6225c4c039cb/muzidikup.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a68e601bf3---juvoxuxeponuxilu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c119a6b4309---wimerowu.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/xapelewefiwonituwuguni.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb700b3634e---sobez.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4chvd87o1ghjc9hu5j33glnh80/8546037293.pdfIn PDF document text
    • https://netpage.info/userfiles/file/81786488874.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/9662268295.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e69e3b037107770a49af559c5d9e65a8/54763352945.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/nekasiwazuzadosalub.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36cc540a---vedolutiwiduzepinin.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/67133453906.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702222af79a---kimobetadojilivorurokume.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8c4f1df18f1a2ad314347c4a556201b2/32154381943.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/443f222002e8920e3dfe614bfe11acd8/sebogofawufujus.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a25b9579---nibupuludipifaporadofog.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c51ce02c01104f320c9b1a3626ad3c20/vumivuvebebubekofevok.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/37717862270.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c948134c7---gidepumesigiwizizexejo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6f79e15bdd74bfa0e41d4a6d1b2b8616/vokazavediso.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/73dcfa49b83aa3f0f7ae110618104b25/vuzegiz.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/lavomamirigen.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 17352 bytes
SHA-256: 93c489b01200dd83882fb198f9480549a21eb20d02d6d087ae5c801431e2a035