Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89951d16bc46b1e…

MALICIOUS

PDF

68.9 KB Created: 2021-07-20 00:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c4ed0a6ccc4f57c2d99c86915039f765 SHA-1: bf647e15d41c86a21189de5749e55f689d1d3e33 SHA-256: a89951d16bc46b1e99293d2d9a0586168dfac576f87379dc6949a36d71b73bde
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous embedded URLs, many pointing to potentially malicious or unknown domains, supports the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ca7e40d31b73de3d3c6a7667088ef84/28645130264.pdf In PDF document text
    • http://pension-erlkoenig.de/img/editor/file/78278474425.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ee744b6e---lumox.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/9vbruch6foim6mbu865lrj5d9c/94948626435.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fazuburuzapugasunuzipugu.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/vives.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/16228681955.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/770a4d4e904c24f7968b211dedb51a9f/82153797311.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/70935549948.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f197346395---rajomidavuser.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6d63011c---fezibowonobizoluvopuf.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5jmodqlig3o6eaomkf8ir0qm0j/nejinukafa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac102150ab.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8e7c54577e75a4cd9c706efbb1a0aa75/woworib.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c985fec---27527014124.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/27678305019.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/depapaxesidazebi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/vuxaxewibakabimijojuwu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e453563ead38561dc3272ff38f3796d2/robevorosuroleded.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5990a344dbdca5c19e2f2e6e3cbe1ed1/74160161890.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/zedozutefewusipomezawexi.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40229768221.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/pesode.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/91965014687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+atlantean+chest+escape+room+answersPDF link annotation
    • 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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 10596 bytes
SHA-256: 0a0facc57a17be0ead8a0437371099eff2b29009c7d2129264e56e2009484308