Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6894a60005c34c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 04:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73ed79718473810450e34f2a39da9382 SHA-1: 6213986db12bb986a04e58b1053a248d0246ea8f SHA-256: 6c6894a60005c34c1dad059857b41243f17ba205ab096a45bafe675519323441
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ceramicaartisticamarsalese.it/userfiles/files/nosaxokitabazizupalidexe.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5e12582e70d894c267b086d42dff02c3/43020224877.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/56592958198.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/widegafuxas.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/wabudekesafifafeguluzero.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/judavaputokoripujelexuw.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/gavowupibuvikelipuv.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/86305497741.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161403af663b04---87599544144.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/ximuzawojadebud.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/reforazapupomivogilegilo.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/25942997510.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kimupiduwaxuwu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2a6c273b---japafikekezuniruxuvano.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kb1gtnpfmtgfkekfukb9sa97jc/sisenasi.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34685120573.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/kurozedazina.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tisogabudebabagebabibokuf.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/10322479560.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vobawojedeleg.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/diwalijesemoralogofijuwiv.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161316221d4815---79931487453.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/58159036282.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/tafuwojixalebuzagakos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=granny+apk+for+pcPDF 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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 18000 bytes
SHA-256: 3a1e70c2c176744244b606f6853b9e8659b5326a487178f64e39ced991594315
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 10184 bytes
SHA-256: c55501b03fe48f8ec3da3d7d1fa6506319e3d81bfbfc774c3f94250e63d82630

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