Malicious PDF — malware analysis report

Static analysis result for SHA-256 85691e9d9104a958…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45fefba06fff38b8e937c00be68f92c6 SHA-1: 0bcbc3305d7f2d55aa5683eb4c6a05ccf6efc4ff SHA-256: 85691e9d9104a958ed016331893f9a7959313fe2849ce13840b21d6d7802caae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of embedded URLs indicate it's likely a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pixomot.ru/uplcv?utm_term=doraemon+download+game PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139276c56e89---29294424556.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfd26fed1---davuvijufigusoxowego.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/35561633784.pdfIn PDF document text
    • http://jfe.hk/userfiles/lodabojafogalatozidow.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/19849724322.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/wadaminoxaderuwoleb.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910174423.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/morub.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/sibewenis.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55ca2f1a---10116009601.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/91402091536.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348fdfdeafe---lirajimemexekepalibed.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/duwidotalututilixedusexax.pdfIn PDF document text
    • https://auto826.com/uploads/files/vokukedawoz.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/82706304883.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kekobofijesobitak.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37837126094.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/gigejizugesajamajif.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140d31d4c---9819053094.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9ceeba152236393d917c9fe32cf26ffd/voxedugekokugekin.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a44436d6c---83850760361.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/jerut.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/2749655790.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000bd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 16456 bytes
SHA-256: ce460e98880ea555a53c84d0c4880eda8acbfad4c87a83b69833042eb2f950ce
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10320 bytes
SHA-256: c4e7cc37bec8caa4370d3601939920159a08c1015990d194126fcb28f0200e44
font_02_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1