Malicious PDF — malware analysis report

Static analysis result for SHA-256 97910a746a7fcb85…

MALICIOUS

PDF

107.2 KB Created: 2021-07-06 22:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ca34d785debf75e9db28fa2d2cb807 SHA-1: 28fc5913c49f99eeb9fa5bb91a72597c82071b0f SHA-256: 97910a746a7fcb85160aace883471c92bfa7b84074d6f918238cc4a8c11d28f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://feng-shuiworld.com/userfiles/file/24168489482.pdf
    • https://aprilboya.com/userfiles/file/25711407351.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/e956bb7676803675641125ac134d97ef/82268215837.pdf
    • http://ahsaipu.com/v15/Upload/file/20215101317302263.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/02foo42ulhsqh9jbdeo1dqb80o/jolekedozosekenixaxoda.pdf
    • http://pressvaluation.net/userfiles/file/simonoreboxapanufijutoz.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b399eaa2dcf---39073373320.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5ba135d9a92213782defaaad9da0f391/katededisomogarajamij.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93619e6500249c78ac698a9d9e39fb10/pevibikarodita.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210621065952.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/nofodigulijegutaxonite.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4a83e49a131a9f8f663b8dc5ff1bf0b8/73128066985.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a7538ad12126b632cd434bbca2817c00/watalukofo.pdf
    • http://arch-teh.com/pic/userfile/85801551127.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/serasareziguvo.pdf
    • https://mangonebike.com/uploads/file/7198724453.pdf
    • https://medsplus.us/admin/images/file/40032837876.pdf
    • http://gramercy-grand.ru/files/file/gakorabomiz.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ded78b389b0---tinox.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c07b408c205c414215c952724b65628b/tisubinukadisa.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/752c8369f9dbd4988885d58217286e27/46677210929.pdf
    • http://flynewsletter.com/uploads/file/xekututixugaviza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2+tailed+hypothesis+test
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140b7.bin
dc1afb2ef779ec0838ea8e0187931c8e3c28c9c54622d10a3ae891e9988afdcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 10424 bytes
font_01_sfnt_off00015889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15889 16792 bytes
font_02_sfnt_off0001709b.bin
89b52e705aedfea532b9aca603c32600b356a5275f64f0a820ae1865333f36f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1709B 18168 bytes