Malicious PDF — malware analysis report

Static analysis result for SHA-256 6019b75de7b6a354…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 06:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3556a784603d6bd5fc5e000949d23bcb SHA-1: bfe57ad04299c7098d4f84b26e92901ab97b8f6d SHA-256: 6019b75de7b6a3540fa939509ff73a18a0d51cfa1e762bc2f51fd292317a090a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious or phishing content. The embedded URLs, such as http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4hctgbco36k3ov49fr9ios2206/rudagijawotawomaxoz.pdf, are indicative of this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jqb64jjqimldhq8bujgnkm34kq/xuxalog.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c940db183---nefomolatevafapadovi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684ab71ff3---nokegogevom.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9r9796f4qtgg4mq0hqkdqj4dq7/jularito.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bogusidoraridoruzutimozu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a261d2568---14397694163.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zofaduvavatilavomedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f89e96a19---84675687025.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/49328fa4252dbca1d80ee8123687695f/sefinoguti.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23a2cf672---18575478997.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5048d40c943f58d417b5fbc6ff479ce9/56093770287.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/rugibosuxotimokolubavusiv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/famagusowuwosaludi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xifatubifazuwexok.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/25574460138.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/kalesinimijemujifa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607329194b0a7---rekamo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/26345962292.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pipumepumavisipabevug.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4hctgbco36k3ov49fr9ios2206/rudagijawotawomaxoz.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/nukaxuw.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/30883754453.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/25aebad3c9bfde733af6b9f402b420f8/44486296514.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f64295c86514e6560a3f96f6aa2659b8/77948633247.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2jtprskscnqi4kua2ai36u42q0/jupenelemezozod.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29636466c---82120701412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=percent+word+problems+worksheetPDF 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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10844 bytes
SHA-256: bb21eb42b46fa417273c5fd2ac9732ef93d8cb93ae79c327714487b19089f2d4
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 18824 bytes
SHA-256: 0c47795b21c902a77c4877e0f7a94992f74fe365a73a7c950baf250a38102d20