Malicious PDF — malware analysis report

Static analysis result for SHA-256 d614b743e591c0d9…

MALICIOUS

PDF

96.0 KB Created: 2021-08-11 07:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2250a0878a1f2ba91759fc1993b9ee06 SHA-1: edeb4fa0d9a0c37a4ae7e09f945025a3df2a6ff1 SHA-256: d614b743e591c0d9357afde694bee4c7a11568dec6d4250519aaff8fab68009f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=annabelle+la+creacion+pelicula+completa+en+espa%C3%B1ol+pelisplus', and links pointing to compromised CMS uploads suggest an attempt to lure users to external sites. The PDF structure and the nature of the URLs strongly indicate a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=annabelle+la+creacion+pelicula+completa+en+espa%C3%B1ol+pelisplus PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ccf9ef6b---wozitefitixoj.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/2781696505.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/47568846409.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e150af761---43984687899.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/89625249525.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c8c1b3f64ee3205847dbf43c6d54a57f/33978029469.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6f5030d144e4325b08b564e7ee773ea9/tujaleboboxizus.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/pujakixinapeleje.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97a97dc4a5---52463853097.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/41923285606.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/90621244294.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/garomozowodemaliriw.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dd6be3f3---58636497222.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/45791190820.pdfIn PDF document text
    • http://bociany.sk/media/file/dadikubifojimoja.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8857a3f01e66942262b80fd8ecba336a/lafenuteduxoratewedodoj.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770f8956ed8---69596584200.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ik45jm15ga3rh26eis2s0jjiqc/ramedepunevixagufagufite.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8e7c27b1---38234097593.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/gekobokuxozitor.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/17ea5719d5d0b9060f0808759bf53998/zobojoloforejutot.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/70490378296.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_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 10964 bytes
SHA-256: 3cc3d1dc26085bed775dc0482447e8a4057e85d45e2f37503be3124832d2d0d8
font_01_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 18400 bytes
SHA-256: 93ce6ad7d3c7e89fc1ebec87280547ecd72a26a301d757e9edbbe6fbd75758a1
font_02_sfnt_off000156d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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