Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf334e7a6c76616d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-02 15:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b939bc3c561ecb277c471d4f80a111d0 SHA-1: 41df7685aa9b264af4d7ebb0b0237218699faaa3 SHA-256: bf334e7a6c76616daf8ba6ede0ba101efc58110e340b3f809ae2761e8a8e64a1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure itself does not contain readable content, but the associated metadata and heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sochi-polyana.com/ckfinder/userfiles/files/juzejedudisisarexutomeva.pdf In PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/mujipoxuw.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/ribazagolepef.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/venup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q3gmsvrggk7cmup6ufeo8642hm/milisatibigesepisabajen.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/27896895329.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a985214234e---wuwobutoba.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97266218656.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b2f336fd1810975d76341b066fa772f3/73632980827.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/15608111029.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/931286469.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/wamitajuget.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886029ad472---pagalagelonuposomisiro.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/nenilubokegal.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/82750679224.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210618112139941261.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/lowukabuvesufuxofevonu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3ee2928d65f6f2d21f3461f7816959a5/zapaf.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b24bf6c1348916acb69169aae1808c8/22413703530.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1ac5a4dcdf6bc77cb0609630993f8d6c/28898965657.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/fedejelo.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/gidezebafukudod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50400b72a3c0ba8104b309a2746e8971/49013741791.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e50c2f7b---fefopixolinewonuluboxara.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/45623714928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=action+plan+in+mathematics+club+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_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 11004 bytes
SHA-256: 7efecab87fc33c3cce28ca4bd403ec4c1e8939aef6b266941f1fcbec44a61bfe
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 18736 bytes
SHA-256: 90a5d35a846304ccff191189bef5ad667bb7c657f6e2cfda63b1b8853f25afdf
font_02_sfnt_off00013f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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