Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f8e9e8e7dce56b…

MALICIOUS

PDF

63.8 KB Created: 2021-08-26 06:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd259a0f7c73530eefcca1390d93584d SHA-1: 72b84d9ea3e64ac85cc0e932114b2bb7e4b8a82b SHA-256: b5f8e9e8e7dce56b412a5b61599982eea1f8f0ff4cc7acf19f01a1cbb3aa21bd
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2431af68792f05708af404f68e3060d2/51085680817.pdf In PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/dixitexaxa.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/jasefusof.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/tifatuvofuje.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073951131014---96419586262.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/20277068188.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e495460d3c---36210994756.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210611_81B51F9E24C1684E.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986b39091f---bojasugogaliradujexe.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/365638991c78aedd97ff59ca02a46c82/45287296779.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/wuwim.pdfIn PDF document text
    • http://rotang.net/userfiles/file/49562538638.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcibrk5mur59b0qjdp4tqolqq3/27761319282.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abfb0425c---vawevi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/dunebatabafapidoxemijuxo.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/46311713365.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/webolalipegujazubifexi.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/22222562503.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/80189891490.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sadunopukobujudasitubede.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a85596d159---46767561130.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/5108335990.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051116314638.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/77403561738.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/sevigirigimotaxote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=why+does+god+answer+some+prayersPDF link annotation

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