Malicious PDF — malware analysis report

Static analysis result for SHA-256 f443d574429e1431…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 00:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae60df1eca096a612da0d16caec83a1f SHA-1: ada4d30f99d162cff3cdb74be5eac032ee5282b1 SHA-256: f443d574429e14312b39325a0d4a6498652e943faa26d328bf6a548cf930aceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to potentially malicious content or phishing sites. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7350

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mojahotels.com/ckfinder/userfiles/files/29233200081.pdf In PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e84f3d54---376061150.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7b096699---71713517694.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900813494---tedivedonasu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/27501955f3a2ce5deade99d812b83a4e/13495981563.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/48944233122.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p872nmeti7hm0ooc23i19hecg7/jolid.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/wozono.pdfIn PDF document text
    • https://wmu24.ru/media/file/wivijitaxedizaz.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/rapedejoromobe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0db036f23---35272426274.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8e8147cb9a8fde7ce3f13c6ff85e86e5/gusefunonatojomuti.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ad49d4240fca034a603e15b90a29d609/18305722308.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/sazimafim.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tevox.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/5202362938.pdfIn PDF document text
    • http://vodnik48.ru/content/file/laruteneterezugi.pdfIn PDF document text
    • http://sam-global.ch/files/file/gosoroledib.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/97378403434.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/937b59658c7dca30d082ae0e11c00671/68271635976.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/luxev.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/wijatelunofokixopizuvete.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6a2b080a586bae7769d6400631100bf4/silegofunawudipiwirove.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/zoketezub.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/57942259181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=compress+pdf+file+linuxPDF link annotation
    • 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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 17020 bytes
SHA-256: d5699a71018035ebbb2feeea9e0c300393e3aa573cf9379f335383612551fa4d
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10632 bytes
SHA-256: dfd0b4e14f88244464c9484324597ec26f6bc3a327883fe17b950cb2d7766eac
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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