Malicious PDF — malware analysis report

Static analysis result for SHA-256 27df5862bb06ad3d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 14:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9cccaecf433d504c05a49ba2df5431b SHA-1: bc14f9fdab1b7bd69b1dc3e17dc7e2776777753e SHA-256: 27df5862bb06ad3dbd3955fc45514808a1defbc6b24bdbb17721dcb1a8f1c74f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mientaytourist.com/uploads/files/puwufuwoz.pdf In PDF document text
    • http://hondatayho.vn/images/ckeditor/files/89924928815.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wigibuvupogo.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/51477225815.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/bajatatetoxorajilej.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/vawewefipinuzasiziriref.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/97002179595.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_073035.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303beac1486---sumemuzo.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/ripijefutos.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rolokunurakefuvaditezo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xobitidotufopadovoko.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/55770438861.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jbl3iu6g3aqlr87r1hjmlg3h5s/vuxosopiriketot.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b43659ebd---17612065287.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/69315410448.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/povezoso.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901110131_5pburj.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58990673460.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/45825737781.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613662583dea0---wasifeboz.pdfIn PDF document text
    • https://fishboat.hr/files/83233994530.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/fugoguzisebileloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=zamtel+internet+settings+for+androidPDF 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10660 bytes
SHA-256: 22ea920f85db57aee3f0168489ae7f2f47795fceaec8bafcc4746efaf19f28ab
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16956 bytes
SHA-256: 31059108faa34c6cf2bedc08bb98337df899b02a3d746b7fb72e6acb4a25952d

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