Malicious PDF — malware analysis report

Static analysis result for SHA-256 04080fa1e3324f68…

MALICIOUS

PDF

87.2 KB Created: 2021-08-10 23:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cda58c9aa52d0013cec6573c352e1b65 SHA-1: eac0b617e9015b40a656e7f0b2ef4a50bd144a3b SHA-256: 04080fa1e3324f68d546471281d6c08999bb457c8775f2bd094ef7f3cf22ba3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is intended to lead users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skontrolsengineering.com/file_media/file_image/file/daperakeguvusawuk.pdf In PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/valetagoduzulewanale.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/14021409966.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/57467330465.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/58287385654.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/79075783146.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a3c241b2---69488234009.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/bedajiroxinexizeduxig.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • http://imi.vc/upload/files/goxow.pdfIn PDF document text
    • https://medtek.vn/storage/file/mexabawelekapenebewedulex.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/ximomiva.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210517103036.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcd39c3e1---63390999867.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/vuberulo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161054adb51145---femawimipowup.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/befowo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r2nep9ddc5jbbgufvkclqm8k99/39054668020.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/88182816970.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/9636972208.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///84466995825.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/nuxazilubemofula.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f3807916a8bcfc106a3b4e7d39820a14/9900586755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=insan+anlam+aray%C4%B1%C5%9F%C4%B1+pdfPDF 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 19356 bytes
SHA-256: 85f0af5fa909375993fe767cfd3bdeb7d0b23412c283c95f7e4ccfbc9d0afc88
font_01_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 10568 bytes
SHA-256: 4cae53d51d00d6d48d5c16631c2be0ee0c1c84766f2d1f909657a3e72ceef97e
font_02_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1