Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b43e431562703…

MALICIOUS

PDF

94.2 KB Created: 2021-09-23 23:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e7b2487f11534b205fc4732f55840cd SHA-1: 7aff0373af53b898596d087820246d6e2224e2bc SHA-256: 876b43e43156270373c0475397c22c4a56ee61d0a1e1f4b414b16c3a5913314f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://oniceh.ru/uplcv?utm_term=dream+league+money PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493a7658cfd---riluzukezegu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/95923489873.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tixatanumezabuvibada.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/68602349298.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/32600549339.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/topokuxi.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/temare.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/18951916695.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c1193afd---felizoweti.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/39431794419.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vogobasewureviposus.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ce677ab329a428a1e2fc6cfbd002048f/35512064000.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/gogizogofu.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/najiwofarivotetivuzejon.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wupinag.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/86144978269.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/62521104071.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109121910393953.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/60047038582.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/43760057036.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/moxaw.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/90609304695.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b37e53c84f21173c2d7a535615b166bb/61778187053.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/kasivudodo.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_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 19296 bytes
SHA-256: 254cabf31bc289905452c7863341d988b6ccca922df91c91926130fce40fc14c
font_01_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15453 10308 bytes
SHA-256: 355dec8b2cfbb2a12abe1cfd2797727bb66b24faa04ebe1d07457da53db96ff1

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