Malicious PDF — malware analysis report

Static analysis result for SHA-256 5341a09eaada3d3f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 19:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7037cfeb0901bea943ce41ee0f222465 SHA-1: 487f40d1f1c3d18acdad4446820de1ade08a4b6f SHA-256: 5341a09eaada3d3f5e7b6f87f96b99bc725a9c2785dae24082cceb70985e8de4
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on compromised CMS uploads. The primary goal appears to be directing users to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://vienkiemis.lt/app/webroot/uploads/userfiles/files/34818679749.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef53b5a92---37009862745.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/30345109536.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/rimajugujaxowigurutonijej.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/85543379028.pdfIn PDF document text
    • http://lscapital.it/images/file/pulugugefixik.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/54427921264.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xozifutolem.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/29886688460.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/dosawelewarasu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7d2d7529282a8f2332c8313fda8eccf7/nezovo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f6ca2dd12df2f55760ba31f5fb233857/junem.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608347d7bc6ae---viwenomezazijagimimaku.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf95d4c2ea---14735698636.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/62785814205.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/fozafikumotajukedokodo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7v95curc2scje1jgc7sa5pbfpd/gewivexanojogeguvofidam.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d0a52e7a0---32511897760.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd2vslgjuro6srb6bt9hjv6ih6/fodisumezadirilewet.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/96338033986.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7ed400dd---jubawujevepab.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e576d50db---ragire.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/jalaraxenegotaken.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b351e641dc---vejupifaj.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3379861e---26068931568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wondershare+pdfelement+5.12.1+downloadPDF 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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17244 bytes
SHA-256: eaa3ec1895d74dab3cb2705f60f6401cdb88225ac241ca84dfec5e9202f91ceb
font_02_sfnt_off00011b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 11120 bytes
SHA-256: a6f95cde18709d146b790de310efcd9a8d34e4b7cddf134241644fe8d94cf9cf

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