Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f05bc9f638c8e…

MALICIOUS

PDF

83.0 KB Created: 2021-07-08 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 47740d3970bee5d74a108c8549e17c24 SHA-1: 36cb116aa3099744f9defab346b6c88a3a5046fe SHA-256: bf8f05bc9f638c8e4d08fc0814405f6ca56c652b2aea7295c7c88a07eb62c298
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics reinforces the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=26cm+to+mm PDF link annotation
    • http://aardbeienfeesten.nl/uploadimages/files/397973488.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081dada31dab---8643663334.pdfIn PDF document text
    • https://mattress-leader.com/media/43440050396.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cipcnh83kgehob161kiperim80/navisirituzeguderodige.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/51fb2193d8ab77c02398793ae324fbf1/99645473342.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bejefu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db160cadc3---94144417198.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/su7qqc16s07ik7k6ku68v777i3/bemetu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0d090ca671653c50c69bc0af21c36b9d/ximawugomom.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de44ac4517e---sopajisumarupona.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/dagukeze.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/kutuk.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/mjunhht0keqfoag9lu05j7m9or/60966076955.pdfIn PDF document text
    • https://coevent.ru/upload/files/valapetutazijogogigilavi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/46380856554.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zafarowo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/84490010784.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/losejurabom.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ca567970---34590330.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bb2c1cc3103b11b7654cbbfdbc8fa720/noxobinetowigipijo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b2892194fa9acc19e5af58413eee218/rakosekonepivesinuxe.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/nenazaw.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/nanavajamux.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/61935735299.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/gegerawurepelasak.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd808a045---87362527675.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bodiwaripapepidowumipi.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 17416 bytes
SHA-256: 6f193ce30338cdf7b5471579f4633afccaef8e6ee41ab07920f92826cc2b5550
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 9780 bytes
SHA-256: d0346f2ef2048568f9335707eaf99547377b138eaaec953a2afd1b42c9aab6d1
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1