Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0afd66ce009b81…

MALICIOUS

PDF

62.5 KB Created: 2021-09-11 15:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba65268e3a626d4bfee23f40b0c5289d SHA-1: 446b603c058a4caed4a37c5781510307b2bda7c0 SHA-256: 7c0afd66ce009b81c854bc735ef9ea49eb760a5ff4c8d6bb6305f07ec86f969b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised CMS upload storage, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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://stancijanegrin.com/userfiles/file/37932839182.pdf In PDF document text
    • http://alompar.hu/uploads/content_files/files/valetusit.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/tunate.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/24753459236.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/41203852553.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/86455366797.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/77759236335.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/64660165245.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/vudidinufuzefofimu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf801b00---66179130210.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdd4b124a---rewamise.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v5ek272ugdvu6ors8f5dher6fr/11350569473.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/93021027820.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_094855.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030245327552.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/junilo.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/83001232434.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/83820120105.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zuwoxifusebebu.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/1812068906.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/faf645a8c7a50220e63d1d6d0ee738cd/xejepakasugeketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=club+lie+angle+golfPDF 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 10292 bytes
SHA-256: b380d455f7bb2e4fb7e10efcd431a6827179e827c08dbfa77f9fe5dbdb94501b

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