Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a907b86911a35e6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 07:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a44dc128f3f874ee75b9261826e6914 SHA-1: a695df9871c3ca9adad16746593bce87780cf37e SHA-256: 3a907b86911a35e64b78709cf3a0ce381bffd5e71d57d0f462fa5c7dafecf10f
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 phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to download content from these sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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 http://burchiellati.com/file_fck/file/tasozizi.pdf In PDF document text
    • http://mgtofubbq.com/uploads/files/83414226046.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/rovegubimilugogezumeloram.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d953b55cf---jadetobumuvadip.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad6950927---95415580728.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/85994313791.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/41435022809.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/bafesitujekaxugif.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/51807353.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gigabukofitesuzunokosat.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vozanuxiworuvopod.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/9d358d3de3303ad938d17b544f927113.pdfIn PDF document text
    • http://ducnhua.com/upload/files/31768693326.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/dujototupaginizofovigep.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/50722697838.pdfIn PDF document text
    • http://freeorden.com/media/file/wugufafenazezetul.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/89822780744.pdfIn PDF document text
    • http://sinoorchids.com/image/file/55003924874.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/sebanobi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/79vgm8mfilkm69ovtegvpkal47/13365962635.pdfIn PDF document text
    • https://hsse.cl/files/42549081485.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zumosofefiparawaj.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aace052609---55329855676.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wojexuxolaxajowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=50+shades+darker+full+movie+download+filmywapPDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 11284 bytes
SHA-256: 6de48141e1289afc98ae0d3b9173b5db5649b03794462103ef684dbf57fba3e8

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