Malicious PDF — malware analysis report

Static analysis result for SHA-256 176896662ac4f643…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 00:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc777ac3cfbee4c1c8093253f3610f4a SHA-1: 89dc5ef59ecfccee09b9b13de9dd9608b5bd509e SHA-256: 176896662ac4f6439f815c97f48008966a305f4e157510c7ff7bb389d76ffe27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to leverage search engine optimization or create a deceptive landing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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 http://madveras.com/ckfinder/userfiles/files/zoletirifez.pdf In PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/56641452190.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/denoxirinemegoze.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n00r7c0le5ev725qub5s3lh1f4/6975861637.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/23a40cd7167a9ef4ab74c088ee541e1d/nugosudelazivegiwotudozo.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/22359887841.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xupofoja.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/63376087394.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/sibekesor.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bonositupofij.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lewemeninaxib.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/xexejidelopitaxuvatepofe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614234500a417---12857095866.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909073045999196.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/tosuvox.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/xopakogovusejumanodoneto.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/62775673796.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac8be5d0eabe6dc465f88f371a6bc90c/jexikalekaxesip.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614094071bf20---lijadarewisipogiz.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5e4a1c71038a1d14f038efdb50b60a8b/kekubewuwepapezak.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69944199801.pdfIn PDF document text
    • http://z500.si/files/vowejule.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/68878480361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=constructivism+and+social+constructivismPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10596 bytes
SHA-256: c5852730af32963fd36984034598de054a824914b361573ff5cdf75e103af22f

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