Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae969f21f0180f36…

MALICIOUS

PDF

91.5 KB Created: 2021-10-09 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 736bd9fd3c2f59b654f2b4346cf8bd75 SHA-1: 9a28d2917480121f0f71b79f40223d9d8002f4b9 SHA-256: ae969f21f0180f36206550442c9f112bb58eea8784e458ebcfac906e122341d7
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 0.4495

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 3

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
font_02_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 20104 bytes
SHA-256: c77a42cbdb431c5e0006fcd16e6d4fe89fa5aa8a0fde4a79cfaf8e560ee81159

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