Malicious PDF — malware analysis report

Static analysis result for SHA-256 42df1ea08df6ff1f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 22:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18dc77602c3203cc2d313cc7dc35c33e SHA-1: 411b2fac6f4a0542be7a440d8dfe69cbf6bba5cf SHA-256: 42df1ea08df6ff1fccb9dbdf13edaabe9030295e3d9bba7ccfc65dae0c560705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to obscure the true destination and potentially engage in phishing or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=historia+guerra+civil+espa%C3%B1ola+pdf PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a6b157e3b4b86154a25fb328e8151fc3/natebez.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e4dc097b---72116637326.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/65177780186.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/59613659324.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/65090077229.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/52950165400.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zivizofovavagefo.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/23922000367.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/98509247374.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/76168963668.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/lilonebadof.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/dotumexoda.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1clb8nlk58sb75ui1ubq77p1q2/62642199160.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/44919633254.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e79950b17---dulaloruv.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/70879121414.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/26769531732.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d42aa4779b0a3cd5453a4530b00e6a79/jimizasibiduvelixifi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/jorovonuliba.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a802b596f4---23658385126.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/firusufovososa.pdfIn PDF document text
    • https://forumsevens.com/images/file/32765062315.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/pevopalenibapimenunif.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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 11052 bytes
SHA-256: 84539e3fe1f94696cc16b39cb92f69986ddc64e5068591cbdfb25f761db094f7
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 19308 bytes
SHA-256: 1d32b6a6c0f97259c4b014c5293a832028cf621180d5c4cbd762fb3d2b0fc514
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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