Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d7f81fe6f8db77…

MALICIOUS

PDF

109.3 KB Created: 2021-06-29 22:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 336292348c2068e266fd712f207920b3 SHA-1: c7782a1f3073ea5da64e33716c4dcd8df991a728 SHA-256: c1d7f81fe6f8db77a96f3c09f506a4e485585c4a12871b9c415bbf5dea490d83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://konferencii.ru/js/ckfinder/userfiles/files/bikure.pdf In PDF document text
    • http://bestbuyfromindia.com/userfiles/file/jijiwufivasixigupulisin.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/jugibuwanobugataja.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/41959839081.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ea8e4567---sijutugitu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c57d07299a6d00d3ef18aac0e60b1b76/revisararuzowakabapel.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160982e09ae94e---rakewojuwozari.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/145014c5bcd96dd777ee7df80f306219/63458880662.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57773cdef6---ravuponosu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430155116194.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a5bbe82e788cc249ac4b294e7ceb51e6/54644303637.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0cc6b7237f7edb52372181604265e6a0/60821055706.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/51884218727.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2479916b11---46858238099.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/d6ja0uin314moc42ohr4gtsa27/lorisewipeluvorulolesepim.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9177ff7f---42767583543.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/74436275057.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/10438243128.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1jmngeaq6msjo7bgb9rdkesmv5/nasezini.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jimawowosavezagofe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b5e95bec---83316059083.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d32d32ddf66---wegarenu.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/linedulotij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+determine+point+of+intersectionPDF link annotation
    • 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_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 20128 bytes
SHA-256: d7fc1068dd3bd991cf1b71f760510a556143c7dcd40744a6f1ca30159cad8d48
font_01_sfnt_off0001776e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776E 10652 bytes
SHA-256: cc0dacc2bf95ef799a8fe20959ed55fc6cb19ede242a8985b08de6911effa974
font_02_sfnt_off00018fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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