Malicious PDF — malware analysis report

Static analysis result for SHA-256 91303ca9d430520f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 02:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbb379cf936da17d21d031e6e468f40a SHA-1: 83482231267466d60c58082e24ef0857ff233145 SHA-256: 91303ca9d430520ffb8f71b24cb911b80e1e344dbee7844e2f82f41aaae484a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pixomot.ru/uplcv?utm_term=how+i+met+your+mother+480p+download PDF link annotation
    • http://pololanna.com/user_img/files/48264876355.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990bc57f4---daliviwezaxuzegufo.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/76215943367.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/66116877180.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lemomadupop.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/99383057433.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/55677869514.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020919468600.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/figebolejileduropimiw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614328b02e4c3---33067766285.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nujubowisipadasofudaduno.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pataler.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/tiboporuxomijujo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16135df6ce0529---rupakiguwurikakamifobisob.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/ruxofonikiwa.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/10295259109.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/jawolafibev.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/ginifizivesunaduwe.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ecd0afb85---93282071760.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/16570683170.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/85571394987.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132311955bb7---80328326116.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4349cb4e9bf790c1d24e0270bf4724f7/mojidepepepuvi.pdfIn PDF document text
    • http://med-os.com/user_upload/file/99439641759.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161446b2d115c3---64970652698.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_off0000bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8D 17080 bytes
SHA-256: b3670c7f79409474d43e66eb147f1f43758c5a3b3e6dd64665d3d66444f175f1
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 11188 bytes
SHA-256: a09d78ed3169acc014f68b15d1ea4b96d88c68bde8e6670df78ca6781654d9d4

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