Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84e1acd5b3ea788…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 00:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47925c5e34fe98a7a47f21da2c1e9b08 SHA-1: 3ffbc894e307e788fa0d5323dac75089c361c611 SHA-256: d84e1acd5b3ea7888f4fc1e3b12a26cbaac367f6a32eea997a0007ddc4dbe7c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the ML classifier's high confidence score point towards a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=zapya+for+android+download PDF link annotation
    • http://azizolace.cz/images/file/zewikizulanezub.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/95587582334.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8264ffe---32969215737.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/jezatamarap.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/64255f1a874c208db54f85bc24d577c3/47265052606.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/merenisonebumunaxeziguze.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/zimedetujimibafepiwo.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/6731150744.pdfIn PDF document text
    • https://mavibusiness.it/file/gifabivedusob.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/33421216161.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42103785564.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zobexivegoridasa.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/55423047975.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090320030252.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mesarukukumumatut.pdfIn PDF document text
    • http://pneusmarene.it/images/file/47354186421.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/dudabuvexuzurudo.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/50759077539.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5a3b4aaf---21387388993.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/zakegekiwefekevos.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/vagerilobekujudidupunuju.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a0f1da49---zewiw.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443cbfe3521---72821810046.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ol492reks9qpah9doc05ql7e37/lopul.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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 14580 bytes
SHA-256: 79a16506915635905f7e67dc475e510c9235ad945024126bf47f99e3454834e4
font_02_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10256 bytes
SHA-256: 9a848ae1ae9de016b3897929ee7bbf9c38c8a33c0bab8535dedaf9acf5988e58

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