Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9650af83c41d2e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 12:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b992ab1136af5eda0db70353a7c8da0e SHA-1: f4ece44d53e3fbb544b2ec0d76d79b03c43806de SHA-256: 5e9650af83c41d2eb235f9cbc8e0778b040658e9c76af27ccc93cb9f12560b46
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, suggesting a phishing or malware distribution attempt. The presence of a URL with a 'utm_term' parameter related to 'minecraft jungle house ideas' indicates a lure to attract users searching for specific content. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=minecraft+jungle+house+ideas PDF link annotation
    • http://musthighschool.mn/ckfinder/userfiles/files/96778702742.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/podalotari.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/9815312154.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/demubovopuliwul.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/18702756725.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/34072069167.pdfIn PDF document text
    • http://synhbio.com/upload/files/ximiwaj.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujepu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/526888291a2378881f026e5490c34387/dojupawejaninasalibazu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1r2ud7r4rlmvv5bjl5r01g00f3/novezeziwidijimowigu.pdfIn PDF document text
    • https://fptica.ru/images/file/31722718329.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13898581057.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/dedonotidujixeverima.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/22693258834.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/jomaralaxenikabixax.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/42069507075.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/65590653814.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/1583361206.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/83559580772.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb0921dd0---naravagusenexegefuwopojus.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109141009418621.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/zeruluwebego.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/79828625220.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613be82423cf4---68393248804.pdfIn PDF document text
    • http://ijfbn.com/editor_up/dotijarizizuv.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 17192 bytes
SHA-256: 2ed1866648907c5e2448d4fb9fbab34a435c747e91aadde77d28b14f16febddf
font_01_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10976 bytes
SHA-256: e2e164df83a751e1cc0e66ebaf6f0db7d7b70af29c573627083907381c37d022