Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4343bedf3f886a0…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 18:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6dfde2de51ffabaec51cabc7fbd8f9c3 SHA-1: f149a3f523b0f2a76ce4b99f76f1ffae6ffca942 SHA-256: d4343bedf3f886a0b189a8d62c923ba4f2c7077ac6fa3db2693c060454409726
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and embedded URLs point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022b809866---97915905757.pdf In PDF document text
    • http://profil-metall.de/content/uploads/file/bibosov.pdfIn PDF document text
    • https://vestol.bg/files/file/71232124370.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/1791948646.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210710_ABD5F0DC1FB99C44.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/gupazujuzerezuputegatu.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/vupijato.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2b782f855945fda6d1bbd0d5e0b43a3e/29945092129.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/419fc257c1d8374a752cd59d3db45c95/lijejufojof.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lepadoxojazigeja.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d89e84b7c---datekeb.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085de09cf904---jebaduxovodamutedu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/88400422426.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/14787512527.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a25a1891---35590472822.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/wunawurupanef.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/62639320233.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/48620582208.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/abee80c058dbeb1d6a26ebc1a10a0506/42307727681.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/80232566378.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/il24su993dnuj3h2e63kk8quo9/bibepofodasarivako.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/dovefusewusokidikigolida.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/92b93e46116b1d7dcb99e22e75e5e537/79699443444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=solidworks+electrical+3d+tutorial+pdfPDF 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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 18244 bytes
SHA-256: 55980f46c6ea56b90c828cef8c1cf90de22205b4b97a08b01c781dbcd2009187
font_02_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 11032 bytes
SHA-256: 62371d3c228ea9f70af3b77b3e6a413d8d4d4cc8c046b479982e9c84dec8a9a4