Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7676e672ec5609…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 09:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd5c05d3c6a41ace1e6cc18532d37f88 SHA-1: 4cd27057e3bb1398c8260087c0506a609f08b418 SHA-256: df7676e672ec5609e504f2a44ec18e6043a5eda8817138b1e31d4ac0ae7843e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stringquartet.biz/web/images/fck/file/58866997977.pdf In PDF document text
    • http://dansungsala.com/uploads/files/66361375789.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/mekotezopolirojatorome.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/95459268036.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109180621197926.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bec77d97---dopisevojodogurumulujone.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613582ced6735---76002205071.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6488118446.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/bokazidaruximibaxidogutuj.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e52838e6748d8bb02350c50ace33d562/26333832010.pdfIn PDF document text
    • http://fitviewer.biz/files/file/suserexisabajedomu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b203131c19---835439403.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zudageb.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/76793054470.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/pekanez.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/kexanuf.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/naziwudajaz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fcbc9e5171dd7cb809ed52c50323f27f/97577158329.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/varaxav.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/18265037317.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tegezofelagixerarenivav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hack+dead+target+zombiePDF 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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 17912 bytes
SHA-256: 2267003d9e6a1aaf1237fb2cc36d13fba69d23ff66d118d3576a00d7b00ca336
font_01_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 10680 bytes
SHA-256: f50e524d532a4796f76a0e0db307db27f1158a28c4fdf9c190f69a69630646ad

Open this report in the interactive analyzer, or submit your own file for analysis.