Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3b7aa3f7d072c1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 03:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8608a33377ac0a104f3c4e55fe7a44b0 SHA-1: 38fadf8ca36a33fed352be9aefa3ef9360ed6022 SHA-256: 0d3b7aa3f7d072c14c30344f6a9d43aca6e612b40774d497b862a782cec9ce2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and PDF link farm heuristics indicate a pattern of directing users to potentially compromised or disposable domains. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=spelling+of+artificial+intelligence PDF link annotation
    • http://ultrabeauty-ff.ru/userfiles/file/78490243547.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedad6a7e8b---lapekogopeligibiviludo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94432bec3---tisoludekesuwogisovafobi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/savetijeloje.pdfIn PDF document text
    • https://tigapilar.com/upload/files/golipezixev.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/duwipelowudebutiruw.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/vepizamiretomo.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/67019917400.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/51366851682.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/subegovujafozawarera.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/h6dlal6eln8ciktl276prutpe4/lokiwujobamibirova.pdfIn PDF document text
    • http://ausafe.net/images/art/files/72506018199.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sapif.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0fb09b429---nogawurixowaxivo.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/gozuzilaliturijexowoki.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/vefurilapixu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/gufuxanijepira.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/45394855719.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/wasepa.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/pifotoruwuwumanufonajof.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e7e079a4a---98910831371.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607130e0c8db4---pabolajinetunupalamugeme.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/pavibikapoxatezesosa.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161237c00808d0---44811585150.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/33aa3d6dca0d26027a46d4935aad8967/budomojokenesesekol.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_off0000bbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBED 16324 bytes
SHA-256: ad324bd78c2c4ef315d6128b9a732c7050fd325dac03c7257cd6593f051e5866
font_01_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 10560 bytes
SHA-256: 0d65cbfca383d8bbd7f86bbf7cd46000e9637be5aee6d764c277d7c11fc1dce7
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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