Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d04f41da1a9339…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 10:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8f464cfbf9e6f6423ad636122e09eac SHA-1: 01ac78b8c5092a1f887555ce1ce531aa0b0830e9 SHA-256: 81d04f41da1a9339161b3063711f7aea133f3484153cb40e2dd2f77a1684c691
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and the nature of the link farm suggest an attempt to exploit user trust and potentially deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=android+rocket+league+price PDF link annotation
    • https://ddshower.com/ckfinder/userfiles/files/lemiguvowikabofakisik.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5b88d77e---6577509286.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/padugugokulaxexu.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/21953018762.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zasodafagejegimurofo.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/gikuwegimaxa.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/8lfkep0vvqu1fl590i4b1m8nf4/wuladutoxekulebijavusarax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/6ug8hhrcjkq7i1gllhkah1kknq/19887824791.pdfIn PDF document text
    • https://rosycaffe.com/file/11892122712.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/xufulom.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d2505045---17699473316.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/82137121165.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/tesaradurumalavibifaved.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/78991935532.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/26591787524.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346644de1a---noradurilun.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/lexakevujijugujotekudunor.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mamesufojo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/64a2b5ff564a36fe87148141f846ced4/55224595002.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/xezijadoduvojelotofe.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/mafavaratikiluniwunuxa.pdfIn PDF document text
    • http://poorclarescork.ie/images/golavexulokijekib.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/19281694103.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2965c2124160231a702a57240aa7e900/86206638581.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_off0000b318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB318 15560 bytes
SHA-256: 34eaab17cb847b9359e736cf837f8885c37ab2a34572036f79f04e706259908c
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 10692 bytes
SHA-256: 67e4f3840110d9a13f2f9f80bace7954f5722f36b1c29304383a92d1248216b9
font_02_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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