Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4beadb70f4622a7…

MALICIOUS

PDF

101.1 KB Created: 2021-08-12 05:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b06398188768cc23c6550edb78bf1f79 SHA-1: 65583b24383a90da6e6f1fdd275f25965ad89e29 SHA-256: d4beadb70f4622a731caf53530136305f3244f8265fb19e6a5656e3815bdb18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703362d811c---54937125545.pdf In PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rumuborakare.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zazuvositifenikorilekajo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9220bfcaa---gubufuz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28724295496.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/55643444158.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/xisuluxumonuroze.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/lewasav.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87f31fd9b---29145151727.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/717cbc20b4bf3d0c1ee5fe0193fff42b/nuxedugufebexek.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4253303d5---68063211100.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/dezusasebivanarugadova.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e32of008kn89vpab747381ied4/riroreluxowuf.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zuwerilojupawik.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2ae6553a1e7326a54b48f5af6ae84fff/lisaf.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/30c777d0ce9a74e3d282710cb0c92ca6/64478427628.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/wifagudararanex.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f8b9794cf634d24e34621cc4ff179bb/34892061539.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/nunewakafisimokiladasux.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d707f4e3ee522be96083848299332014/xavibifogu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddb3765fdd---25141689732.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ae1107056ae01cccdbcc80d59bdae8bf/52136643579.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9f2c48243715c21b8a2d23bbd2d0dd7d/tojatepisapibor.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/90041945901.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/883710b55244db4baf584f89fc5224c0/20003330665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=list+of+birds+name+in+tamil+and+english+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_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 11040 bytes
SHA-256: 458cc207e8b07d3207407398bd3eeec7ebba3be3ffe7687998a8cf4cfbdcf5cd
font_01_sfnt_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 16720 bytes
SHA-256: b738328647342aa9640c764d00001302c702f255d9c26f8d4ba7cea61f2fd3f3
font_02_sfnt_off00016bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1