Malicious PDF — malware analysis report

Static analysis result for SHA-256 2897b2876575bd19…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 08:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9eeab7b759a04d0cfda899e6f8d13416 SHA-1: 4840b06904ce2d009858c2c53049092a5b96f07f SHA-256: 2897b2876575bd19c33ad694c5810d76fd7d2ba2245d554e50e4a4a0f33eec66
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160804af68e0f4---mitijirinisak.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lj5ed8bh7ac36a4htenit8uvt1/54550290826.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7b04580fe063e9cb82481fe5cb765b79/8333121785.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/87842945947.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea531d8aa1c9de17811e8cac11f73dfd/lofurereto.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/sasakanutuze.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/dadawifulumalituzapufati.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74af7ad22---gamuwati.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/60800436248.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lumuxi.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/tutopasa.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/juwet.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27a52c2c4---jeresit.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3882e683b4---fimofakekef.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/voknss1g4lduvicamjbjjb40b6/31063942100.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/889a6611a833035be0d9fc385150136b/wexinorodug.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/00eda8f62f7f3823c1e0cf7241930a79/52397199349.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bc5db721---jinebijizowazaki.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tac3ur53fbl5tr8lrs48dvgb7v/kerovukapavox.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/40511616049.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/83173407658.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/fimibafubakomujeg.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c872ddafd8---gebiguduxasaderemuji.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sirezulurigiwuwumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=state+null+and+alternative+hypothesisPDF 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_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 10844 bytes
SHA-256: f9794ad17430d655fd67f44e15c30fb755bee3c297910109a0d92fee8888d201
font_02_sfnt_off00012df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF5 17652 bytes
SHA-256: 939e3cb052dd43736511bcf06c90fc2edf60c7895e94d6f1243069ff5a06f1ce

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