Malicious PDF — malware analysis report

Static analysis result for SHA-256 68545201d968a3a3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 02:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ecaaedb7db50f20c7264eee8922daf8 SHA-1: 94bea8da30cfc6aee3e3781a7702112d15448e8c SHA-256: 68545201d968a3a3593889e6f8dea0f52d1a51c10a7167e8d311dd7df6ca801a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://livilgirls.com/files/gorawopivafixuw.pdf In PDF document text
    • http://agilesolutions.in/uploads/19702000681.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/76278536908.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/99158457204.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/67008466955.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/xizetalimike.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5a3833b47a3ccc79effb0dc1640aa15f/41434531098.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/kolarufinoner.pdfIn PDF document text
    • https://suncables.co/images/file/vekimenonuvufokilarivudag.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/vubenonilorifaxaz.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/39918130248.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/fizoxori.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/gelabetepugerulisew.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613908384ea4b---58170082772.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614a309bf14a0---79048080683.pdfIn PDF document text
    • https://tekmaker.com/upload/files/merefijuwuz.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/23377722572.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2u3msdthggq1tsi7qnsikev6p4/zopasirijivuli.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136489448fa2---14205136063.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/52660720024.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210911_023042_8637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=super+mario+online+androidPDF 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_off0000acf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF5 10464 bytes
SHA-256: 780ac74144a8cd117270800d1a15208a74982cc6bdf612bf422904b821948736
font_01_sfnt_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 15064 bytes
SHA-256: 9c6f1e6b60a3997ff3b6cb8522bf5e6bef354d8059bde195f32d3d8a8e1248fe
font_02_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1