Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7900029ba135b85…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 10:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4780633c842d4f3bf05619fbcecb642 SHA-1: 9289833b600a4ce52abd8f101aaefb8f4874f5eb SHA-256: b7900029ba135b85bb12c0e28071127963243fc38ea6be070771764dd6a71530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://megalightgroup.lv/uploads/files/89733416462.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc85013af---73397119182.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10debd7650c223c58ed1f4760a7b6115/pasuzedinezuwalokozojawo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/rirumobegolivatixenug1626462483.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/jesukavawupaxiwuvilogijo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071837f6c4ed---16668411470.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dd621002e71d4e8e3b29fdf083578232/sixonavovakur.pdfIn PDF document text
    • https://fultoys.com/userfiles/fosipewug.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b58089a24---namukewepum.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/3m60antcfbi68nf4bmvvpc7b80/82309329548.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a0e46a4d---3605866167.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160865f826b427---kojomule.pdfIn PDF document text
    • http://linza-market.ru/upload/files/wofujogesewakak.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c13ee99f---nilezogipukejebuwufesokat.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/64819060985.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/29667322646.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/narogawudokivurodotejel.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/xewupinuluduwa.pdfIn PDF document text
    • http://midel.me/userfiles/file/xolapoduku.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/2935234674.pdfIn PDF document text
    • http://idroter.org/userfiles/files/73778153968.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/nilemikodepafelo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8c177f5a4---42252362580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=debit+and+credit+rules+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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10732 bytes
SHA-256: f1c87651ee4fd4bf3380c2a2e4e5fecd74a89c38dbb32dc6fbe7d53c492e3d9b
font_02_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 16060 bytes
SHA-256: ebe08826e814f4afccafb4b0f040bb59977867183f00648a41f3c492686f5cfc

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