Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d28ff2e3d62d79…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 10:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b2240158d1f2525ce247185a68ad855 SHA-1: 662ae550fdf4369f0f9b51d2f12f29baf62636ef SHA-256: 93d28ff2e3d62d7971d04127c9f2dc8911896906db67d9d9f42217c5e2f923ac
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://wonikquartz.com/upload/editor/file/1631820235.pdf In PDF document text
    • http://yuemeism.com/uploadfiles/files/samosamoduruta.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/wozusuxanuzedavenemogegi.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/kexawavefunewodimoxul.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b8hfmua08hub4n83eachjk6o41/vibapifuwukoga.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/17585795408.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/dijolukebi.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/5065177472.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b46fc2a12---65660909885.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/44235484347.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109070134231784.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/15735413893.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16148dc8382ae8---88025045680.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/ponuronegedo.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lakitolipet.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/53549595969.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/219cf29951a53e4244f565dbf32e1938/27845121206.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pasemumubaxegatezeto.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/melinasadisexokawu.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/gotijobewodu.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/dilapolabiv.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/retuxudusul.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/xebosupubajiwida.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/2689363571.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/71669425896.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/143941686661458371c552d.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zamizinorubenonut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+x+and+y+android+game+apk+downloadPDF link annotation
    • 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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10864 bytes
SHA-256: 27fc36bac13f344a48e88773a3dd504849e2d2fc28f754c631762af995a6b68e
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 19976 bytes
SHA-256: 5e4aac8e2c40931e1a052107ef8cce17bdb017d835b484c03d8c53a575adf46f

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