Malicious PDF — malware analysis report

Static analysis result for SHA-256 727b768b515eebe4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 11:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed68cc75d4a56a2ccd68c231cdbc791e SHA-1: ce86f6ccb30d07ca730673d320b67bd02881c91b SHA-256: 727b768b515eebe45fe653c59fffe64e106f566062d8517f2dde268e7ed09447
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7907

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://cructi.ru/uplcv?utm_term=upside+down+cross+copy+and+paste
    • http://dpnovelty.com/upload/files/69849867772.pdf
    • https://santehsevast.ru/userfiles/files/36028944172.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210905_92D42C24274143E5.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/levubafijiset.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d417b16b4d---pabuborotorudevo.pdf
    • http://h-n-s.net/userfiles/file/jagezubutanavevazumudo.pdf
    • http://aquatherm-graz.at/files/74523770568.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/roduxadafujunawowot.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/60876677496.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e535ed86b0---kufuwujajejem.pdf
    • http://tw-sincere.com/upfiles/editor/files/65855649494.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c651865---fogipefozuraki.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/roxabifukobu.pdf
    • https://torbay.ru/images/uploads/file/xixipitofakororimud.pdf
    • https://ourlady-schools2.com/userfiles/files/7979586747.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/99b75cc0a938e35a2444078cc8a5c1f6/2742354773.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/92651702094.pdf
    • http://exmar.it/foto_fck/file/59287717656.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914114728665453.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/diwolarixarapixum.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93e.bin
e2b8eb1faeb451cc8856a4fd6018cfa16109da9bc042054200af9e248961daed
pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 23616 bytes
font_01_sfnt_off0001066b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes