Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad2e58f4da5303d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 07:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d92eb464af250940e1c3e55b0b8a51e SHA-1: d3484cbb48ca9f455c6cc1246cedd60470f35b1a SHA-256: 1ad2e58f4da5303d566a20d16111057f0c232d31f033b6f5ecf2f8578db859a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised or disposable. Heuristics indicate these links are designed to direct users to potentially malicious content, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://timebymtm.com/upload/files/13630260387.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/wesuxamezomuwanaketulapov.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wizixogenosapif.pdfIn PDF document text
    • http://cobmedia.hu/include/87934974117.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/lawekesaxuwasaxejazukivi.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/saputajekex.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lqg7jbv79ue8vhgaerslu2isp0/mazixup.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/ruxowatofuwunud.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/xemikevavaxopereliweniwow.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/denanomo.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/bebelosovaxetijezugixuvo.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/33514771908.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/zomejulizevoxudorowota.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/19965031982.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • http://egitara.com/upfiles/files/luxigunupete.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b57bedd64---gixuxulibotodige.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/598587e0e01cc753585d10910b9719c1/8715308014.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138aabb2d59d---xinefisovi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/40051034136.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/86210754954.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/91148326664.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/misasupijajijizitutiju.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/fozifizexi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133177bc7f03---59612703060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+aimbot+download+pcPDF 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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 17220 bytes
SHA-256: d0a5d02107e2821f207ac6414cd57355fd4d7a7832a20b80700254a594dc5c24
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10708 bytes
SHA-256: 90974e15cde3a53009337e8a6866a8850b699bdc3b970aef9b02df8b440859fe
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1