Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df172a58a4b832a…

MALICIOUS

PDF

56.8 KB Created: 2021-07-05 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 577ad1330340de4c9688604a2388252b SHA-1: e2eea117e6dca352a61e0b960af2dcdfa029a7b3 SHA-256: 4df172a58a4b832a7a5091c4a514e7c1e793b7ab170395b4d7a1f3c96ad1a332
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as a lure to download further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection and ML classifier also flag this PDF as malicious, suggesting it is part of a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5388

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://mya1fc.com/files/ckuploads/files/pixalaselukepo.pdf In PDF document text
    • http://indemo.pl/Image/files/21406083619.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xixekoxajosuvugiwigazito.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/bapabin.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zinumerakob.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/91947989009.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b459a62bb2c---revenobuwafejiterizezes.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29134495798.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mich4vk7gb67imqh8jedsgqai4/lemarofobogezowutar.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/46726736349.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83837e49e---40180310087.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6916b59907---33029108706.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/savewubatewelujugubuz.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/kibisiviwilutewa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7730957ecce0cdcb9cbd2b6c4b483db2/velamodat.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a194714c52f---gosaluzonibeliweviki.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/57102137989.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6f8a7475---bomizabuturezebobuzogeman.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1a29f37e---vilugavojurened.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/dowopuk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8781f3037133d925360c444b707d6e4a/zananinusalorewalusopeku.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c49860c4d---xuruzilowefupidubi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/antcqiftfin69mg2vp2n2aufn9/bemupedabisanitu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160843989df946---73642062318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=i+really+want+to+learn+spanish+in+spanishPDF link annotation