Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f42ff31fe60c8b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 06:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d76b5cb52ae8305672d880bcb2e7da7 SHA-1: 5a83378f38e1759957f669e9fa418b80d97e6a8e SHA-256: 50f42ff31fe60c8ba5d912a82f7be4c1e27912f107f599155c75196db55d168b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://diskacme.dk/images/upload/file/4012296158.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa2f2e36b---jogaboxafiwunumaxaxokow.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/31833392611.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6fa5f53575d558b0e8e8df912596b394/66919165748.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/93548116077.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/72f8503efccf71d84b95e84ab759f630/wivatotitugusebadavik.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608663311e65e---84017629048.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/95458677439.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c412a9cd5b0---ziliritupixumaxiw.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/vuraguvisud.pdfIn PDF document text
    • https://turbooto.vn/upload/files/43244927004.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/fefulogane.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f236207a5---58518155574.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/maxulutu.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/42312901888.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/78013413617.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xadewifa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a32547237c0---xanilegafenejotatufomex.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fec44c512a11a72d971e1550b2340816/mekogiserufivavinukefoz.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6883d07d---vilokezewijefumo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/jijewuwebo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092be0aa83d9---jupamelagi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/limaxiwowisalituwur.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/ginusajubapabowiridafona.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/344f33c1f1e73cf4c4bbf17fb2591479/marodaneruzosopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=driving+school+near+me+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 10744 bytes
SHA-256: b5c6ee58d3968421482c622741ef15ecb5d226a7cdfa282b2a7ea641d463ce6e
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16736 bytes
SHA-256: 08f6ab4c91e6463e1f4f93898d2153775cadb4ee0c1a3985eb56ccbbf82c037c