Malicious PDF — malware analysis report

Static analysis result for SHA-256 453f2d5347939343…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 17:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c516d9e9522c71aca9da90dbe9ce604a SHA-1: a3c7f2cf579c836c02fad956036430a5ee8c33cd SHA-256: 453f2d5347939343f6ea42535a5578ae7c76201f869b1d56be6ace4549c87bf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=android+brand+market+share PDF link annotation
    • http://goodmax.ru/i/files/86602545587.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zuxijodina.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2dd14e5e13f31363c4fc0afcb85fc328/wikomasiriki.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/1072414458.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161313ce629d24---mudisewuguvewubemisiw.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/malasogubekezodojuvu.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/lanajeput.pdfIn PDF document text
    • http://edeins.com/userfiles/file/95042193314.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f339b45af45e70e1dfd7646f9f473fc7/60166779414.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/nijusujilinodavagat.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/mowujafawagulobativu.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/57424421077.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/muwijixenenifebewovebazu.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/52619322037.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/nofewurujireki.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/doverizimomekuwabatabe.pdfIn PDF document text
    • http://mobil-tech.com/files/sanebogemubomadepeladefa.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/66012458592.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gimuxijefagasorisor.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369543e66e0---19949063393.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/43312293896.pdfIn PDF document text
    • https://vientangluc.com/upload/files/63715709952.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/xekamogazanukesuzis.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/47701240693.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/dojijumitovemamefadurowe.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/jiramalef.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e011353f19629d268c44399435e677d6/mumujirakivepisi.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 18048 bytes
SHA-256: e46d95f0c8f206209099dba2fdc5e29711d9a0422e4eeb7654ee171e05e98961
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 10680 bytes
SHA-256: c134500a38f6874f3465a9c2d157b181c081eb8f00702ad383d16d1e3fd798df

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