Malicious PDF — malware analysis report

Static analysis result for SHA-256 066d6f78e5065046…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 21:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cde227d31e08a8164a9a5cb46f08ed6c SHA-1: 766a874ea622eb0a9a6690418897d05e2d017758 SHA-256: 066d6f78e5065046bab711b24f33d355ee5148fc2a811368b1fb1df3ecf09611
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7032

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ac3881a41---51389786154.pdf In PDF document text
    • http://decaiyun.com/upload/file/2109011444373351537mva1rs773yl.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/29119635781.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/17141069264.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/40173339020.pdfIn PDF document text
    • https://norservis.info/files/files/10182089586.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/33218619132.pdfIn PDF document text
    • https://ms2oke.com/contents/files/99551301987.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32131218324.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/garulijifuwevugor.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/givukakefevanosa.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/92299643982.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/19344773307.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/614a7cec0b801d55dccdb55f853c1f65/fimizowibadaz.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1j97pibfbtbinuu9h6u7t0jatk/97625063778.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/fibodafi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/39309805472.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03ca92b98---tovuvosibowozipe.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/67235722602.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/fejujotiwaximifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=games+like+mario+for+androidPDF 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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 17016 bytes
SHA-256: fdcfdb4481f0fd5984358d1f31cc4b8e8f3527a864d1140e4ae87abb9ab81da2
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 10548 bytes
SHA-256: 49a5f06bba5f182435072039e6b6309240702872edf1a6f0ab5c69bfb98ce863

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