Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d4bae480df1c0c…

MALICIOUS

PDF

78.4 KB Created: 2021-06-14 22:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 98c8c70f6e4f8da3b47a40cfae405702 SHA-1: 3aa83cd2257e9547c57453f655580d49370f977e SHA-256: 56d4bae480df1c0ce3db58e034dd11197e368d9a01da6d39afe958d914025d14
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=short+textbook+of+pathology+danish+pdf+free+download PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1ed346beaaba4e7631b5974c02e2c948/kefidinij.pdfIn PDF document text
    • http://dhf-china.com/d/files/soperakemuzu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/pubbbutu5nohnaj6fmtbvn2v0a/81869591374.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ab213ef1496b61f7e63dad7e133e2f69/84655806461.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/04ce3a5a3b655b038d8bd40572d772a9/65766517098.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/f11tij67s4o3ktid4ks61br745/12867645677.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/0j6e4nnvselhv88e76f6vfi316/88362286430.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/21392517436.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/99225506795.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sbnndf3a0str2e8cgvkggafe2g/57585699087.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gewokatujova.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b2d96a9ac---zivukasanuwoke.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/m0clrc8b4h9eu9h8h3deecvi25/28633523135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 5872 bytes
SHA-256: 656b2173cf8d2f71ff5083131e0b68b4d52083d63b03ca9225dbdf88308bdae8
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11520 bytes
SHA-256: 6f723a008294cafd7c2f90e18b50640f032690f1969f1413a22a578a80ebf75a
font_02_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 17012 bytes
SHA-256: 8001b015031b24d3e766dfb7d37209032cc6739249388c8b064e80caf760f444