Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7768baa3db3ef8…

MALICIOUS

PDF

77.4 KB Created: 2021-06-30 23:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f553987523134192fcfb846b0f4a725a SHA-1: de41aff55ebcab7b65b66630845ec72de474ee8d SHA-256: 2d7768baa3db3ef89dde4c24073d7905bc2ac26638f07f1e21cb9fdc6fab1eae
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but reinforcing the link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=join+jpg+to+pdf PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071df928b813---78205477884.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/74674113320.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/66533196654.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7dcccf2a---wamilexowakepadupesagatul.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/rufiresijox.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/xudiriperamotowagepemari.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/pixuzuwelaxomevabuwilipef.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210610_1F492464E1C1F633.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6e356a3d037bad73ed02cc0fdfcbe5ae/gefovopomipulinebupebum.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df98aa1dff---gudefagawukakov.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896748ca522---30105880241.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077199d25031---poxunarovavok.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/vesupegirasix.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dfe25536---movolasavevajofora.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zaluze.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd614f836---66153102230.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jusetajosenogelegovesuza.pdfIn PDF document text
    • http://poorclarescork.ie/images/faxumarijadux.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/zegomiguz.pdfIn PDF document text
    • https://magerp.org/upload/files/92775033701.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/q47o392b0jmi4237kjo4pj8nf5/89464930729.pdfIn PDF document text
    • http://benetalent.com/upload/files/34552801326.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d456029655---6783442124.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/21812304632.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_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 10188 bytes
SHA-256: 06046dbcdebd22fdd304eee8d202a18c7301deea39a87d1ee27a9238e13b4730
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 16496 bytes
SHA-256: a1de424caf299d2e0d1f426469427257654273b19e871f6ea30e615515c44a5f

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