Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9af0361bfb57531…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 05:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69a93403ed2a133daa226c373b31d49b SHA-1: 7787db1a00627ef2a9d123e58e2dbe17de206b6d SHA-256: c9af0361bfb57531515d1f2200d233c59268c8fe89e18de9aba636686d5dc665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=ipad+air+4+price+in+pakistan PDF link annotation
    • http://villaelen.it/userfiles/files/zupesoporufabo.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/mowanerumipubijipivodimus.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/jutoresuvabukewejebav.pdfIn PDF document text
    • http://vina2002.com/uploads/files/67885071328.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/19940488883.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/97133307571.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ea2309ad---veteragupaxuzovubog.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/sorebefutitowemilojorumo.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/pulifaxonekipanafivo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/reluvunasikaliv.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/89369052841.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/46619118947.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/2406213215.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mi7q4dipc8ofej5bqd718up7va/bezuvolovo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/5935725766.pdfIn PDF document text
    • http://gazetavk.ru/img/file/47532334667.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/lelifo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/junaburutebupijukogilize.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451debf1f7c---kuzofefose.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2666cc04355d96e7cdbbd4103e2d791f/38558857310.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fagonikopebarexaruworataf.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/tokuzadexaga.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/52482159029.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/fabopeto.pdfIn PDF document text
    • http://bscartridge.com/pic/13605820329.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_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 10460 bytes
SHA-256: 57cab14258c0633c0723b37347d36d70b6cd008bbfa3327e399749ddcfe4c1c2
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 19116 bytes
SHA-256: 347dbe37570e50767322407adf5982d564c7f7fb0300cf287e48b2e715d0eb35
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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