Malicious PDF — malware analysis report

Static analysis result for SHA-256 2138721e98fd699d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 14:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7520062ced60ac4f975ac94e807a4c17 SHA-1: 8bf290866d4078fd034ac4edb945b0c2c5c0c478 SHA-256: 2138721e98fd699dcde664d85c8fdbe21fc6a2fd72c23152601456129cb1d472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=gi%C3%B3+l%E1%BA%A1nh+%C4%91%E1%BA%A7u+m%C3%B9a+th%E1%BA%A1ch+lam+pdf PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609910801bf51---zibeselepizorekes.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/vitufor.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/rijuvusukomaxad.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/97651156291.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021071816163773499.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/nazupobo.pdfIn PDF document text
    • https://cartolmania.it/file/80499083937.pdfIn PDF document text
    • http://rilta.net/userfiles/files/dupurusomovugedozezenamop.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/trvqv2jqkfvd8f1so4l67viijj/fodozuvedogitinejuru.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098443ab097b---ribefujasixewuluvabi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7b3a51a073bc473d59476eb7c117c409/samalonagevexodabibob.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sovasajisudalugazole.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/gobuwemazera.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/67063676209.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608914ee2c05f---degifimadutufo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/10769710469.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/808ffd363e7eb3d5f13ce75da1d97f23/denaxisuvawiririnug.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/mitidobapuvi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36ac86382b---92630684533.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d198ft2h3fvhfkdmjs42pgdhq/befodo.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zonewaboguzovub.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mcj81ctbrbojrrbsahb0fikulv/jepekekesesezadobapasixu.pdfIn PDF document text
    • https://starbox.fr/img/files/vusowotiserunupe.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/fukewiwutod.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a795aca674e---52093426697.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/58740675762.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 11340 bytes
SHA-256: fa2e687adb29c6f3e0e195db0852e0fdc419e5cb506b79f0f75ed81233a7df9e
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 29056 bytes
SHA-256: 3032bb5f76e05e7d9a5ea8d2ea06057f2da1a99d4e134d3d1cccb468b256210e

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