Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab5f8afa1f7da0…

MALICIOUS

PDF

73.4 KB Created: 2021-10-03 01:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 774245dab1579af9a961f0d2580a05a5 SHA-1: 3b6dd8dc746980fc7b5277dc7ef21f74f8864f22 SHA-256: b7ab5f8afa1f7da05dd07b65cb02b0840ad4a6176e863ad6ba5ebbf94572b3d0
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. The presence of numerous links pointing to potentially compromised or disposable hosting, identified as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://masonhn.com/d/files/36596519586.pdf In PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/82720534571.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/vurotarurezojozirekegule.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/58476816804.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/tabuzoreduzupamu.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/dovuxobi.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/80421707860.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7c0b4ffe---85355828335.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/pamajopimofekedufovoka.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0f160e3264dfd8bfec460450be055f76/sivegejazodopasoletotimi.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/32285586117.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/56441083221.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/pakedikozujo.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632120223.pdfIn PDF document text
    • http://screen.by/images/file/nojuwunezi.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/10959541187.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/14510274913.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf9987c82---bedixijavibawigopafuser.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/wenovipozaxakebigisugidib.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/67080751223.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/86564778322.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/66863725890.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b179cad65---24169655465.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6999f12ce---6522388367.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/vilozukujiradelel.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/tobivof.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/gozosajafukusorojej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+screen+recorder+with+audio+for+macPDF 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_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 10936 bytes
SHA-256: 3d6703b7aae607dec45c83a8c13f5128cb4f54b40755972f29e89786c73a173d
font_01_sfnt_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 17176 bytes
SHA-256: 1b155b83344ea94b0b07470b8a7783f65351a4379605297f0a68c9da2a6da7f2

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