Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b7a9c9b20b253a…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 13:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14bb942e9d0c6b8a5e29f58b4752fac0 SHA-1: 2f4fa1e4719c37d2b105c7df764221eb52a005fd SHA-256: d0b7a9c9b20b253a7a604422bf821e99e6a97332be284cbe0d604c35ce0f6e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious 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 http://goldsunjsc.com/upload/files/75546890425.pdf In PDF document text
    • http://modern-pro.ru/files/file/58021319762.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/46299132645.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowixojukefujufova.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/6429236403.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/jufuvisedosopozema.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/visipolebafuwudizeber.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0e73d50d8---29448256644.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kutovukigomulo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1b9c993e---94157242060.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9742e2d79d00816e5cade9bbeb1f69f9/24911046809.pdfIn PDF document text
    • http://signauction.net/userfiles/file/gekoz.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/rulunujebevorilog.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/dugozebifonugelasijowuj.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e286dbfc---86669819224.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e8168cad---taremud.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/34456161768.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/64ac7ade10f06b4117eb1e19bc81517d/10299980642.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/68920654912.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/xapapeva.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/raxewafoberamapuda.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/28128062086.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/17803804208.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160711bf1bb9ee---bepewokofawuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=open+interest+meaningPDF 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_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 20480 bytes
SHA-256: 8498e6b5c07a7605c524ca7fe1c4966f537b0c38d1ecbdb6c0633daae0fbd6fc
font_01_sfnt_off00014322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14322 10452 bytes
SHA-256: 1ffebf3b2179bdd955dc79d8bba76f13eef3cdb25e837c31a2dc7e72391e24bb
font_02_sfnt_off00015af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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