Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2df8b714b7b3cc3…

MALICIOUS

PDF

77.5 KB Created: 2021-06-30 15:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b6384e06cfd47de9583d636cda39c47e SHA-1: b896a406f0be32b29d5aa5b6cf17e7ff253bde7c SHA-256: e2df8b714b7b3cc391aa93d15710b0c6f427f7caab597c828ee9b4eb78e3fd42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=sonic+sonic+the+exe PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j9bavhja3hl9pnr3bdm5dl6n70/83955758119.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/denivaroxezan.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0a2a868fff0af0529b3e80ebf7502675/menujawuboximazeladofa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a553eb265113f8735c8c52bd785f2eae/14758613882.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/topedikumibarimamig.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/18/files/53248624103.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6db8mbk1a5ljq6eqhe5di4uvo7/20455148400.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607642b689a34---jezisug.pdfIn PDF document text
    • http://learningkey.org/userfiles/2255149764.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf11627af---50623659812.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5da8e15052b1fa4cadb6c38d08722456/5636020281.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/53a4866706737c2216d19d96b0dacc0d/37565449574.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/xunasopijemowipinapo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nojabepe.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2aeabb5817e7d0d49a7f2c2a7587a0d5/gixofegukovobel.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/20018770468.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd50f3687f---16346099238.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/13309069795.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d0c70ded4eaa5ccc1fabe11f0960d6a9/46930443882.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210529170539.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daab5cd727a---sobaberazadasesepagujoj.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc7d4657bea2a3b9b1e8a79835742b3a/34670576007.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_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 17136 bytes
SHA-256: d7c52820e675f83e9e8623390cdadafc5f2daef929d0f39f8c51aeddbd021785
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10196 bytes
SHA-256: 327d9f1710e81e6fd63bd8905aff724b151b6ae3bdc4d65177100706427fc424
font_02_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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