Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a52b7061fedd0bb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 08:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b87dad2392c43b1435a37d31119418f SHA-1: abfabbab541c3cee7b2f6c174bb8e07c0012caa0 SHA-256: 8a52b7061fedd0bb151555e19d5c1961bbeecb248757addd076520f830b6eb49
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination and potentially leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://selapro.com.au/application/third_party/ckfinder/userfiles/files/gesujugeluvudetuwiwebu.pdf In PDF document text
    • https://lesura.net/userfiles/file/22276936993.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/82619308655.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9ad7a69bd6e381ab03aa135ba84dddff/84737274628.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/vuzuloxororagedigopejoz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mupesatazija.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/63f1290873765e626fed5f21f3e9700d/fasunaserikadi.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c95532598---samexagefajofopomabofip.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/46617372851.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1sue3m5lfv7pnagpe70nie0ve2/nikosilileruv.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097efc598933---99785639732.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/42609766845.pdfIn PDF document text
    • http://generaldistco.com/images/file/gadabuzebo.pdfIn PDF document text
    • https://aneri12.eu/res/file/sawolaxero.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/66072203479.pdfIn PDF document text
    • https://luminex.pl/upload/file/8577491004.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/146be762f8cdf480ba4d12588a42aa30/59054361572.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3328a9a19---97629040602.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/55000343333.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f719406452---mopopopubome.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/nesowim.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/tufamokexiduraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=singapore+math+worksheets+grade+7+pdfPDF 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 17196 bytes
SHA-256: a17c3698d521691975469f2dd9831ce61522b2905ba186b14e80f08c961b3406
font_01_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001207a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 11204 bytes
SHA-256: 648ebe99858b6d540e455baaafe1ad88bcbe3d317f6ef1161195e689a4fe6a47

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