Malicious PDF — malware analysis report

Static analysis result for SHA-256 9305e66457748e37…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 15:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74f46877cb416224ed4dbe3cdef4b973 SHA-1: 1bcffc9105d0e24b4dab2f4f6bf5da1a063e462d SHA-256: 9305e66457748e375a59a69036f4052d06834278a75d44484c187aa51d080b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=compress+pdf+installer PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5054c5d904---15480877631.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/28476121740.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/97954769782.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nt9tln5i5i28fvs0tvh9phgir1/9806107270.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/vuvolekufut.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/jogoxifuw.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/gufavipomuvevonenafap.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/bigakexuzilubugeba.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/dapinujagufonuwudag.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/sibuwudisufilalur.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5b133f4526faee7aa160873e6894d050/17018368046.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/81890503078.pdfIn PDF document text
    • http://btfa.tw/upload/files/dukox.pdfIn PDF document text
    • http://generoussecurity.com/uploads/kulilusigasanubi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/51296722905.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bdc0640a9ddf8dccb36852544790d3aa/86309630791.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/xilavegirigu.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/26910614646.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/90790308510.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a8457e29c---xeruke.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/nobejazugitebotilelakenen.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/kaxapabibus.pdfIn PDF document text
    • http://kezmosas.hu/files/file/lajosizikal.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a06dbd19e---riwurajux.pdfIn PDF document text
    • 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 17384 bytes
SHA-256: b30092e26dbb0b859e2c952ec2466efc7387c7480391ea7d0400ec6c30b13c93
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 10692 bytes
SHA-256: 446109698dbfa242645739c08fc43401af46d1ef1624841fd1d2ffedb49945eb

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