Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f313dadb48e4ef…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 13:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16338ace732ae36a88213a7726fb834a SHA-1: 39d3f067c6d32e69a9c80cba1686450810739dbb SHA-256: e9f313dadb48e4ef284594b11d7542adbb42afbbda613e4d69bbd3666e39f9c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/zifoxoviwisixemepif.pdf In PDF document text
    • http://hoanggiaphatstone.com/upload/files/1286368591.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/68922335089.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/rbj73an80u5j8ica8ifhc7vd0q/bazojezare.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/48234260548.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/sipujo.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/40285079310.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xovoxilujexumamujazesi.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/tejefiwumipusi.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/82055511432.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/wuxumivi.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109120404126680.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/68387767852.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/relobumutebofaselel.pdfIn PDF document text
    • http://compsult.net/userfiles/file/47244008287.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85334596826.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ef5628c93ca6c789f4ad36604c71d688/mebevalesofuda.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/35018950006.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/sinuwa.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/bobutatikinor.pdfIn PDF document text
    • http://vo23.ru/upload/file/jipozirokudidosalo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417219272a1---48066450220.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/leganasapegeliwowonu.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rosunavajubojoribaxakana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=completing+the+square+precalculusPDF link annotation
    • 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_off0000b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F9 16848 bytes
SHA-256: f8de5c72086e79e440d9b3e08abb05dd0a4027c6b47efad7606ba6bd1aacf377
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 11096 bytes
SHA-256: 3ec7c80b76374de48321501b927ba076f1a8ac3ce695fa91f5b465b0f538dec6
font_02_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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