Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1974dfd4c32b8f0…

MALICIOUS

PDF

83.2 KB Created: 2021-10-09 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b2af15b1be5cfcb1f4467b1e9813b866 SHA-1: 26155fbff14bbfe7066241a1b5d71e1f8a0f6f2c SHA-256: b1974dfd4c32b8f0f15dbc84826e036b2a37fcd372ba2d4fa655bfdfb0aca19d
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing attacks. The ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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://crysiq.ru/uplcv?utm_term=free+exploits+for+roblox PDF link annotation
    • https://bbpartner.cz/userfiles/file/zebugodapufiposorimosegu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/punir.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/13980205752.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rozibejosukadumatoba.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f600abe4168ffe64fb8029a7c04138a/51407497184.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/bubotege.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210909220649432549y6oku5.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615608bc5f7ef---66954028834.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/38956188731.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091403284873499.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210918192227.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/juvifatuferil.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/tivaxenodunepadagidolofu.pdfIn PDF document text
    • http://learningkey.org/userfiles/77396430153.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/44200047537.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/razotezevujo.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/4284031882.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/repizizamabiwusiberop.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e5f60f4fefbc85ed9ccd373b634b5c3e/vatafedikatexa.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/22423604699.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/risedudafazobosebatiw.pdfIn PDF document text
    • https://mu-rrrc.com/userfiles/file/kopitel.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_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10304 bytes
SHA-256: d30ff7f819fc46e1b33430b26eea96ffff41a9a357c76987caa6b22f4a12001f
font_01_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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