Malicious PDF — malware analysis report

Static analysis result for SHA-256 79037b2ad672c07c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 06:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a50c5f6a8965ecb77fd0f16d14876cc5 SHA-1: e16949058ad17109a57948c0dbb866443dec3ded SHA-256: 79037b2ad672c07cde361cc8fbf0b411d6cb5822b32a680b8b7c5013ce905962
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.logistiekverbeteren.nl/ckfinder/userfiles/files/78378043088.pdf In PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/70193906145.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xoxasafo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ece0e69c8---84479597157.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/18402589961.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/julifodatosepogiteweva.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/76085317508.pdfIn PDF document text
    • http://hmed.vn/upload/files/63446500302.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/36244647086.pdfIn PDF document text
    • https://tigapilar.com/upload/files/90656066300.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4c66ca02---sivikibomalorujalibeja.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/067c6e68c8f4340352dfaaf48e27d312/fezunanulunupuzukibu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/talariwelega.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_D523104DBB0E1623.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/buniwi.pdfIn PDF document text
    • https://777mto.com/contents/files/diwunexamadesukakegupi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/56642412855.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/wazasisesef.pdfIn PDF document text
    • http://stisk.com/file/16481387508.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/83834576347.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/90633948981.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/razodezomozetopuxesala.pdfIn PDF document text
    • https://phukienbep.net/media/files/68056502223.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/nezeribivonepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=domestic+girlfriend+manga+download+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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 16484 bytes
SHA-256: d769a60c41be7b72cdb31ebaa346bd20b187040adf9d873909e44c06e6881d99
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 11048 bytes
SHA-256: c29264be39baf1829d079058b0a3d4c3c58a2445d496b87ab4133623a2d6d44c
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1