Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f45c33047d73fb3…

MALICIOUS

PDF

83.1 KB Created: 2021-06-23 06:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 72c1fdea72ef90a3609d6c1e9c955713 SHA-1: d06411dd0d95bacd5e93bf0f56f0e173c708aaa3 SHA-256: 3f45c33047d73fb3fad445b24b6c1f1489b415b33f812ee5d3f5d6184c61eabe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely using a lure related to forms or documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://langumeistras.lt/i/File/75415419955.pdf In PDF document text
    • https://emauto.lv/index/images/up/file/rimurewogesefewerixikusek.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tdfp8dhnkhg8u72qf84kvo8uj1/67949070686.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6587dccb2d---73686825309.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/07723df795e056b33336e7f0100c24b8/guvusetivodod.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/16lh6g8m0dh2httvusmktjigb2/nulojodosafexibizot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5f864e8e---zovozix.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/zalikinuresotufudavawe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/012115844f1413f98d6cf31652ef025e/luduvonuledutorax.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9cpdepqj76bl82a7bifia5khts/20244821415.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/23080895026.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/niwodexi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tutejikeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=que+es+un+formulario+en+wordPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 6832 bytes
SHA-256: 8754c72e8c0f7b3401ea661cc2653fbd662acea6fa1010d206a71130c1fe0c2e
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 5208 bytes
SHA-256: d6ba3e40cc7212485fbcd18ce9e6e879015975c44a2be034f614c8a99c4d7ac7
font_02_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 11584 bytes
SHA-256: aff3e13762e70e351ac64575090ad7503a8494cbb31b04d7511b423bbfaaf9b1
font_03_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16484 bytes
SHA-256: a0df4ddff381a7a36f0a8572f000f8ccb0cb623fde86ef7378a42d839a66ac99