Malicious PDF — malware analysis report

Static analysis result for SHA-256 5760733fd5a0e5ef…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 23:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 294ec7f8065450adf517e8b62dcba06c SHA-1: 8594b660d03f7dc68e3594812aac1fa09e5960d0 SHA-256: 5760733fd5a0e5efa122d54243922d0801adc048bfeb50f37fdcc300c16be29f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristics and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://laptopplus.be/app/webroot/files/userfiles/files/vigikedufuvejibeguma.pdf In PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/84807207173.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/49b693dc7e342ae2f999148835e7d618/sekur.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/98008957002.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/17965263759.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/1797619503.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff8c22c34---45892738560.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/37537306423.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b0ec57e0f776b7b71468266c3786afae/bamalilus.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/41504447149.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/19349082621.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/nepupatiloropodixaju.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/380761751.pdfIn PDF document text
    • http://kunbot.com/upload/files/juwekuzupexedudasiruro.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381080b4e54---17016199815.pdfIn PDF document text
    • http://katela.net/userData/board/file/53136057665.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/fesanenujemilofatenapa.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/67011216547.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/5078909471.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8dec4c8477c5303acc807d1618f3c952/28355420991.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b56dc770da8bad65606d579f2e432302/zobazeroweg.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9d75fc86---7735492810.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/simifetiguwizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=worms+forts+3d+apk+androidPDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18440 bytes
SHA-256: 90ea621de29aaa999bd82d80aaf5b6666f1e5e8bad6c3fba1e398332bcadc786
font_01_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 10740 bytes
SHA-256: d576f0893409727ca63ea209aa7d97dc6d5c0e645a882f160e7f57a816bfe7fd
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1