Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52e02c6a90a285a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 14:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c51629497c8ca349fe717cfbf14d67b SHA-1: 30cff7ab83b110695d0f383d3e50ac1a2deb1b54 SHA-256: e52e02c6a90a285a253bb0d5f37739c31733da0e5fd0ee7c2ca88e443d5cec4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8669

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 https://mimpishio2.net/contents//files/jutusowesipizutuvogat.pdf In PDF document text
    • http://abwplazaview.com/uploads/files/97748290418.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/kajoxapopopejipenegoruru.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b24bf6c1348916acb69169aae1808c8/22413703530.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/zekin.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/nipilarukudalosudig.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/79625413451.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/tulizuzujofuruzi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/kojodufosu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tobodegado.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/efh0biopnfgcctula80bdf64pi/57770019858.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6pskotk8nmr2f9055tuma00pk/luxulotumu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c087c21023---pazebirefuzed.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9cce969e48bfe1f72ee6e26eb71f9a68/15871467022.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/rafutuvagomosivul.pdfIn PDF document text
    • https://qnzar.com/files/73757114021.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/pikagekipirugojisida.pdfIn PDF document text
    • http://17njl.com/userfiles/files/46504509613.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607458f480759---85090653574.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/31f45d936f8b38bc441e1485ec87ef80/jivebulojitixokizik.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/79708606571.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/bbbf7037ed2f9d2635dccae4fcf0ab91/sivisimuref.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/90235430397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=waking+up+married+pdf+free+downloadPDF 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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 18824 bytes
SHA-256: ea1fbd60a266c3801a1990fb30f98ca73f0abc846500bf0065dbe9aeae07d2ca
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 10848 bytes
SHA-256: d0bd3ffccf9390183366a2526fe277c35e44561dd485b0577d86c4c000111d00
font_02_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1