Malicious PDF — malware analysis report

Static analysis result for SHA-256 520a1572c5b39173…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 23:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a32b3edd981d97e8eb6299d05bec1ea9 SHA-1: b675a55ae7fb50d6f11aec04b1ebfdaa910b769d SHA-256: 520a1572c5b3917384a6a9e6fdf305467908d921becbf7be428b931e744e6b4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ketchas.ru/uplcv?utm_term=dom+quixote+de+la+mancha+ferreira+gullar+pdf PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dadf984ca1de0f4de17c6e8d705d6736/dovudo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608004cf2ce79---kabapaxoke.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/devefagagiluzawiza.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/82059451360.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a188230c69fb1465112a5f79eaae1b74/lulajuvizuveraw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613135b0a2ba4---suvevudotapodamaxovusaru.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/83898167026.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf614c62dd---bipasaso.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xiwinixuser.pdfIn PDF document text
    • http://qdcmd.com/data/files/topetopumumepig.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/53521320267.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a583eb57ea9---36600021273.pdfIn macro / runtime command snippet
    • http://cnex.cc/images/blog//file/39190466522.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l8b199m42ah7finjnqjamcim05/lekopafepebagaxiwuvunu.pdfIn PDF document text
    • https://patc.fr/imagesfile/foxavapisuwunubovasirosop.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22dde9000ddfe0a838884c205a4f563d/59637489845.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02b1b4213---jiriva.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd03229464b---64294623069.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/guxareloxonuvomeba.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/516e194a80e47c2058041219c49fd4b8/vijinimumewinetodoxumug.pdfIn PDF document text
    • https://acryl-bg.com/In macro / runtime command snippet
    • 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_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 11248 bytes
SHA-256: 638ed9573fe56e1aeff1b2f9b2fee5c7b7f16e491e705f7590a1e217dbed0dfd
font_02_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 17464 bytes
SHA-256: c4132016cf268d60cc94baebbd5494449300c2962d459b005d61199b6588c2fa

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