Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f0e4959484d4b…

MALICIOUS

PDF

73.4 KB Created: 2021-07-19 09:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7a03e30a399ccea41da520550601bdf SHA-1: cd7e44eb14d5bdca12e24fdf58b787673b998645 SHA-256: 810f0e4959484d4bfca6b32cac262f6806ff8dafd64ce2a552130ae8cee46ad7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://inistor.com/ufiles/files/48262393135.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a2e1b5fdb956057a9d98a60c4c5b1e1/98240278247.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a94e74a5661---mixupu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9e615d68---lojeropizemu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/23f93201899dd8cfba816f0ee0600891/48009924936.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/72412059087.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/han7rosa0ekie1nud9a8d8c1g6/67773517148.pdf
    • http://gdlianyu.com/uploadfiles/file/nuzog.pdf
    • https://actorconseil.com/files/file/madubibifitovewin.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/weladopadolo.pdf
    • https://mirrorlink.com/public/files/files/25432897821.pdf
    • https://nikosdimos.gr/userfiles/file/tinavasotuketiwigu.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/82d782ff4340727790ab9fafb362007f/72978903552.pdf
    • http://sns.hu/_user/file/vafeza.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf494723c8---madorolebanexilenorizaza.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f167f0539---bewawesife.pdf
    • https://agmatbaa.com/upload/files/28412328498.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/jd5gsk87ll174vcbojrr59vsmj/58385744300.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f1136b91d---89815066262.pdf
    • https://allmassage.net/upload/file/20210715180138.pdf
    • http://balone.net/_upload/file///bemafesupujabonop.pdf
    • http://afghansolar.com/userfiles/file/nofosaxexitavemizifom.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d98e3b6b---fefivinejafaligapeji.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160799d44cb783---44835204557.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oyster+chop+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be48.bin
72064035196dffe364761c5a5b2fd1d6f2ed270756f022a1f060d99704a44434
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 16516 bytes
font_01_sfnt_off0000e926.bin
3c75bca6f56fd69bcc115a70a6cb80e031a71642084b5ecc232d3d8f5b884fab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10304 bytes
font_02_sfnt_off0001009c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 16792 bytes