Malicious PDF — malware analysis report

Static analysis result for SHA-256 68916ec5096b5788…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 18:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f8a2d895c1afb7b4afda109c2f5aaa9 SHA-1: 9ce44b145049ff879714a718e1f6b36e5c87c9ea SHA-256: 68916ec5096b5788937236cca770e08e765d4f5301c1a1f5853ac72a77980d41
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://urotunisia.com/uploads/FCK_files/file/30107148872.pdf In PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/47867772775.pdfIn PDF document text
    • http://boki.hu/editor_up/18193808603.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xolofexaberaxozawuwujexo.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/tikedip.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/21156544502.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/zodugixudufebozakokij.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140737c9292c---42720267816.pdfIn PDF document text
    • http://castel.lu/userfiles/files/bozinatawadagosamag.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dulasopeborupotodeselu.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/xogowuvaliluzemukoma.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcd28acbc---bawivijekubediperim.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/29892342145.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/nujavari.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jolikovaponexomabe.pdfIn PDF document text
    • http://theponghop.com/upload/files/murijowitatilobosife.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/80838864960.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/27222610090.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/gekubemurifinoxovipal.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jaxesexirupeloj.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/niselavajanivarexo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/300f6a61bb7c0469a3c9c200493d6053/nijomalomeripamojos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fire+hd+8+operating+systemPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/6439397813.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_off0000b8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CD 15332 bytes
SHA-256: 733170f0ae821744b1148e78b8736522d99a965099588dca83c28bcfc68f6384
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 11092 bytes
SHA-256: 20801800518ef7c22d69538674e9c8e9c81c151c479d0c7167b89f596a53bdda