Malicious PDF — malware analysis report

Static analysis result for SHA-256 37142ec92a8668f7…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 09:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d69ef409bfcd47617fab8d554537bd9 SHA-1: 606bac88f1534bc794c8f1c1ca6682170829a686 SHA-256: 37142ec92a8668f71f4f0868a6a334597f8f4a38ec70f57cad3bde897b5a9355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the structure of the PDF point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=scarface+the+world+is+yours+game+remake PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611b11628ba0f---fekatuluzenurod.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/10093805231.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/38f66052c4c1b73fc6ca43d0429b1747/85059658941.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/jufisawuron.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/wenitidabikusixo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c1lu12m2d0ugdos5o2v7n0rpe3/2187722690.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839ebae7953---zaxitun.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/41106115747.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16230449776622.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98cf83727---57985214291.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/49749572113.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a754e83e---66172128745.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417db1c8f8---wabikozixikovoranuso.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/3484186665.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/gemix.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/9e19335638376dec8cb88d47942cf91c/wewizobedemutovemuda.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/66907447119.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/kerolagofeteno.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/20838607925.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a3def590a594a22d848e723e60a7de3/solasalapobutobufuwexisub.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5479b21e83f0372ae1325b562fe5cd8f/wider.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/kisovedozokiforoj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f16abb32105---ferikajilurexu.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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 16984 bytes
SHA-256: 085dad5d95755a7183b2cae36d53befa5ccfb8d2bf47728d9a00f07e55475845
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 11284 bytes
SHA-256: 6cd463534c263e1e0a88429bce7b7d6a6864621aed21f44cee58f332c5c195c4

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