Malicious PDF — malware analysis report

Static analysis result for SHA-256 939742c50daca98a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d0833fceccaad57ac1da851fc3cb9e1 SHA-1: 21d6112b5c9cd3cfb72ffc43ce7c970668f5581c SHA-256: 939742c50daca98aa6ff6311323944fd93435266715cefd4133805c99c89a4f7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to host malicious content. The presence of embedded JavaScript suggests the PDF is designed to execute code, potentially to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=cyber+crime+in+nepal+pdf PDF link annotation
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/fifepumazasiriv.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/fibix.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14838793383.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8e114419e8174bcbb129aa1a329b3da8/27730530587.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/nibodiboradabozebifedala.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/61201224108.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdfIn PDF document text
    • https://tsegypt.com/file/gutilexi.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/56231686240.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/dosifuwiziwigoxadufagano.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/88663810961.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wiwam.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5925d4a77---jaxokujizefo.pdfIn PDF document text
    • http://koutingchina.com/upload/files/55937847200.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16123bbcb921ef---19819896249.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5ece1706a---dumuxog.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/kumamu.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/57602744019.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v5njjk34kab9qpc1thcdm344ch/58957505146.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf36f98b29---38620966295.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/moziwibalap.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lr0pjm3adflhppp758m4jkkmja/15118854089.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/noct573gmuuj0j1fcph8lffibd/20429787771.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_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 17732 bytes
SHA-256: 2ba1929ee75c133939c20f7db8058ab3a4ddbc17c0c264aca0ff7bd411e17c47
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 10680 bytes
SHA-256: a07c2771f7973c2442b191fe183130e6f254046cd6d7b55d25338927c9bd83db