Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a75f375f0c37c19…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d3815fab13b30bbbe69286bc5a4df15 SHA-1: 18c808d3d7e01e94a3e79d26ec8ce20efdfc18cc SHA-256: 4a75f375f0c37c19c7a33dfb56a6d9c1c3e4f06ba2280ef466433e7379c81766
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 or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/20459418685.pdf In PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/nadude.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r9hp2t2c2bpiutimjgn5eag3d4/misinorawanefejogasape.pdfIn PDF document text
    • http://climtech.com/files/files/48945710894.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/3010056321.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/57511672337.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/galutivifupuwenerizifuso.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/36793947546.pdfIn PDF document text
    • http://emaaravm.net/upload/files/bopuf.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gisepepefibuxu.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/10951028518.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/98595484332.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/10037159342.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/4673693215.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/vapalidexutunefoxos.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe6f17e57bf217be802fa19d80765ff2/labireforeraxujuzo.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412f9db4e08---23703083665.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d566296e---6838373781.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/judonesojaruvin.pdfIn PDF document text
    • https://uangraja.com/contents/files/12173855262.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/tutasogijifidazovoliga.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64255387962.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/69975648027.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/96633772395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=planets+distance+from+the+sun+in+orderPDF 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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 17940 bytes
SHA-256: 0aee379f5266487a00413b5c9daf67d5d3ed5e4e6c5d7be0a84937ae55bda604
font_01_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 10844 bytes
SHA-256: 6b0e230aeda7173def27c476aad63e3ce58180e79567b812cf425891a4ab1f49
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1