Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3825d68789a1074…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 11:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2646dcf1c0be82543e600ed3cc297d21 SHA-1: 3690b5dd4ef11eface60bf958c359ba5b16643c9 SHA-256: f3825d68789a1074e257e7731c6c2b3e0902d7303e915a3799e5090c01b95497
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=where+is+chat+heads+on+messenger PDF link annotation
    • https://leganordavigliana.com/uploads/file/17594851320.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161389f88affe1---91843853842.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/ritalidavegutogeduwonuf.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/bujogiwumazujebakukuw.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/98902055479.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac455cf04---givaferowifigovupolozurat.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/06d3ef10e88421c02712a9371a3d1680/bubejewela.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fiwigavewogivigurezapu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e30715d36fb224f8ed69576ccaff6761/navububafopipiwirut.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/31502932464.pdfIn PDF document text
    • http://asqcert.net/files/files/68681894506.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161362b0bbafc8---81411587869.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/danusenifuwojes.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/12967721457.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mojotadexibor.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/47305558906.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/zatoduxamoxuwon.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/nikefawuwebikufifarigok.pdfIn PDF document text
    • http://szhlfz.net/upload/laxomewiw.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdfIn PDF document text
    • https://seikai.jp/free_images/files/63470583916.pdfIn PDF document text
    • http://napiarsaigh.com/images/sawimuzevibaxumasudus.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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16760 bytes
SHA-256: 1af55a8b8786ab4631a1d382d688b4d6788f37f1f7b42926c6e0a59796b6f511
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10764 bytes
SHA-256: 815ccd7a3851d814644b2092dc6fec27d901db9222fe0a0ccc91979480f02bcf

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