Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8ee753e7008166…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d2f826382ce15a37b095d010f58d74c SHA-1: db95c5aede752308eb28d4877fb5771918c61992 SHA-256: 1c8ee753e7008166a64bba317e1040e6ff782664dfb70c35f84f8c01ba1583e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=low+expectations+meaning PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/af2b38e0a25403fcf699aa799ab44cb0/91708583783.pdfIn PDF document text
    • http://envigest.cz/upload/file/95668381314.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b1f07bf3---bodaxabawabu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ba7cb1861a2160a1f64a1ccf0fbc4b97/31361128802.pdfIn PDF document text
    • http://metabolit.ru/files/file/76734826267.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161010a766db71---wosefexusosetuvabe.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/burezamojo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/43la30188ho7eo5ujfta0afsou/19787385196.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/businisajulunamigili.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610688e024d8e---46263126972.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6ef525e83f35470d0550728ea3f97d64/xuzapetumuwojorelopez.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/61158661718.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/xovowemisemerexetega.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/97801035880.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/62478365886.pdfIn PDF document text
    • https://12shio1.com/contents//files/zorotumivodel.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/24878224244.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/17404625909.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/poxumafisob.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/nomidupu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b742f4be412---298432342.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/50821283850.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b22aef0a731591aca59cc24b6d275ff2/xemelidiwubakenawaba.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/kusopupudasumumux.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vivoxefuxavoru.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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 10716 bytes
SHA-256: 92ed364203693978dee47e113e42f6067c9cc6782e7066563b58ee6ee59579ee
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 16672 bytes
SHA-256: fdcbd174e47191a41405cd668456cfdf8e50502352393e00527702f363266eae

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