Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b64718e4dfd9792…

MALICIOUS

PDF

58.0 KB Created: 2021-09-20 00:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eacef3020c6c95fe333530329c468767 SHA-1: 9e2bc6af2c6178c458c1e0bb859e65b543f0baec SHA-256: 5b64718e4dfd9792c159c2924dc8a203ee6df60af60455e16fbd7d131ff02163
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6828

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://wastran.ru/uplcv?utm_term=yoshi+wallpaper+android PDF link annotation
    • http://sgyscom.com/upload_fck/file/2021-9-15/20210915215858549741.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/ritunitibazivegenizulusun.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/22111294254.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/babetudilezopibu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/vekamuravofoxikuwafov.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94f39690d---9592436773.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/nemuvabasorozas.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jefelo.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_074706.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/66083446481.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/92433053387.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kojozedeninawexoranetebub.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144506348ab5---63098908091.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/76207143147.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/64835101518.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/monadowiwokejijudab.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/poronawobukarolarifopisi.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/zugidoje.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/dusopodesit.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/18729970328.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9080395f---24313732726.pdfIn PDF document text
    • 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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 10460 bytes
SHA-256: 6c6a224ab8dc547032d0a80b44948a808fae3c1019d091496fa4eaab3ebf43af

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