Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68a055774fbf8d…

MALICIOUS

PDF

89.1 KB Created: 2021-10-21 17:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0a2d3cc4b3f5ed2bda24724de0c8ca3 SHA-1: 5ec754f9cbd02d294d9984c55eec0d70facf8254 SHA-256: ad68a055774fbf8d25b611e7475e16adaaa2a6f3b9439a150565a8ede226e777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised websites, likely designed to trick users into downloading further malware or engaging in phishing activities. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leo.tw/upload/ckeditor/files/lebigelapikudasotidi.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9e773e3f6---mokidojunijexexuz.pdfIn PDF document text
    • http://weingut-suppan.at/files/50411162926.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616e1a19cc569---20107476879.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/16679ef480ccf17c083ec5f0939d8eb6/ritedunagopijifoluvovevu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/rexiwiretepinote.pdfIn PDF document text
    • https://codecs.ro/images/file/63605113797.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/xivedolaru.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/regozokifebonomabepabixo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b280333ac2---bupete.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/losiranimamub.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/38415902034.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/notulo.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/55653471372.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/67549908499.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/vopedasevivamemip.pdfIn PDF document text
    • http://envigest.cz/upload/file/vixolojiwetiwem.pdfIn PDF document text
    • https://insp.biz/img/file/tivefakilib.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109211500579485.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/mikomiwaxumewujub.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/94851069357.pdfIn PDF document text
    • http://nanopena.cz/upload/file/naserituto.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/giruw.pdfIn PDF document text
    • http://ymmicro.com/files/files/kejotivibomabutanozajago.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65057211268.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=top+best+editing+app+for+androidPDF 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_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10732 bytes
SHA-256: 76ee34196c73dd8b57620dc421a2785dfd56708e4c216d86bf58362f09dcaceb
font_01_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 18368 bytes
SHA-256: a768a226981b8f4f0b0a81e3e678dfc58d1ce5718edfeb8b0475cc6efd6b87dd
font_02_sfnt_off00013e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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