Malicious PDF — malware analysis report

Static analysis result for SHA-256 e700d6eb11080138…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 22:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8311be47383734e31f53b9d042eedb8c SHA-1: 178894f97802dde5e95dea4985e8b348ec0b9aff SHA-256: e700d6eb1108013829ec44fe3aaeae7af7ad4e434f6c25fca2de345ad7725096
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These URLs likely serve as a link farm to redirect users to malicious sites or phishing pages. No scripts were extracted, but the structure suggests an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dursunguney.com/userfiles/files/fatowalebegulavunebibunov.pdf In PDF document text
    • http://polenes.cl/userfiles/file/6692424326.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/67jn1nu3m0sj7apvf2d1a4o2cb/libufujiraboxov.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853acb44b85---sivujepigebinusinuvux.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pebogudijeguzabad.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/30129188845.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/50284201263.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lopukafafujapasotesur.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/buzexite.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntv3va2tolcfp0675lvv4smk1j/45839289481.pdfIn PDF document text
    • http://premium-t.info/files/files/29798829272.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30594487788.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/62b89f51dd75b8e2fd1e4ef2115ae72e/21687491652.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa18dd284---kezafajawan.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/070075eba97a3d5dde28b7e912ffebce/23530017317.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9nqo3j1u9tlvtl6t96oe8vjvvl/54289740410.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/92913245727.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gawivawekoxesef.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6896c5728986eaaee08d7577acf2358e/51349536660.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b683dc02d---1792054451.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6174a7c32e78f13a1cfd4e54c35f2172/nonunujukozodu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1b675c391d3c6574377384971190e05c/87782106163.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85be0165f3---vijotaketulizuk.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/80825048896.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/42750303522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quiz+buzzer+circuit+using+555+timer+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_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 11128 bytes
SHA-256: 34e8889062014279c5835f59010dcf68a6083bfd9ed2c57560432a30fa4f976b
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 18560 bytes
SHA-256: 99c949288eafe399af92658c02916b37c0d6ee8371f9446a8a7b659ddd0e431c
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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