Malicious PDF — malware analysis report

Static analysis result for SHA-256 354a54d824c6ef70…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 06:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8935ddb477b423124e7eb0db07b4f0b5 SHA-1: 1e7384c6bcc56659a9c122b1ade0f68ae5d59314 SHA-256: 354a54d824c6ef705189b93e2c9b95bd2bf1da87d041225bdf92c0e08f820998
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious sites for phishing or further payload delivery. ClamAV and ML classifiers strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ydis.kr/userfiles/file/060819317309.pdf In PDF document text
    • http://brlairport.com/images/file/rasumenuxulefox.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/37544660413.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tuvigegabubiwo.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/vakunowu.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/71833261448.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ccf65c285448c4f2f26d2d6fcb96faef/75668803270.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/bavekamimubokebevoju.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71aaa5916---66749615047.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3dc2a95b---tuzibinosavorevada.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0eee57af62cc93b1cb8b06a67ce4bb9b/81264466504.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/2391812654.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/tuzipazub.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/52922231139.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/lusofikixizevesodanevu.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/tasinefasezifo.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/39341922866.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/31127681129.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/29327844753.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/joraworekogezesagududonuk.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/62417472348.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/letimofiwizup.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8456e6d53174ec230cdcce910a22ef68/78134895537.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xewamonewotegoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=generator+v+bucks+2020PDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 18676 bytes
SHA-256: a762479f7412b551981edbfad49ec2f544b6a2ce91ca015fd0083197836d1557
font_02_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10764 bytes
SHA-256: 3522beb229e4695be63335c885997cf1c78cda28ef6e49ee931a8e601b93472c

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