Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6ef27760e5e40e…

MALICIOUS

PDF

110.6 KB Created: 2021-09-05 21:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b43187ac93c60a41b1a6ae74fd19e3d SHA-1: 52cee49df6b4992d91fa2970498c152d91f9ff27 SHA-256: 7a6ef27760e5e40e3d58a6468be362f6df8980fae18f505ff2d1480edadde545
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS uploads suggests an attempt to leverage these for hosting malicious content or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chiesamadremarsala.eu/userfiles/files/revimib.pdf In PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/terukosuvarujojudidebuk.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b81f41504---bukepunobifigarefato.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/badomaxozetulumirozi.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0bc10b45---12527799054.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609794201e178---fumefobalolobeveg.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/mivuxufemewux.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/filegedarazufurekizus.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/40464298568.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954f2923d5---48738097717.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/36089797088.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6717a00cf---68700758235.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1824dab339---jinikopedabagulaxatodig.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1fb050a7e10b64ac71d944ac7fdb4a51/zuzixowodulapijuju.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/62603557069.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ffeafcc157b68c823aee8532801e2cd6/16582770680.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132e2781e07---36107770362.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/14446909378.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/lazolewesur.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2011704424.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/58128483261.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acec76858f7---jikofagux.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/renilefipej.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f07a07e146f---39577645825.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/91241301657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=is+456+amendment+2017+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_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 10976 bytes
SHA-256: edb595a479767d373162852af2cbcfebcfa83ea227cb133c8f94f540b20c6d31
font_02_sfnt_off0001795c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1795C 19404 bytes
SHA-256: 8f74089b6dd62db600210e7b8720e0b7da515bbbefb02af625e72764df12f47d

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