Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d5e9f0cf524cdb…

MALICIOUS

PDF

130.7 KB Created: 2021-06-11 14:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98816872b5468e8e8e7435b23e0709d2 SHA-1: 6738f8427ecc39043c8b978e975c68bfb5b43159 SHA-256: 16d5e9f0cf524cdb51b04269dac211f3a73882efec1433ff42efd8f0afde71fb
156 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 pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=undertale+art+book+pdf+download', are designed to mimic legitimate search results to entice users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://garglob.ru/uplcv?utm_term=undertale+art+book+pdf+download PDF link annotation
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f236ca6c76---botuzevanopiken.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be720aa3012---rovololivu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c64b1fcf---xofit.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/71d990a6a1191ab701ed914d7238e41b/foseledosoteze.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n1qinqnqe9tmbcg3ll2b202svh/kavumoxexiwoneriwujed.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/vasol.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6fq324ru90qhoggbltmqcpnfhn/zobumadaponelixejavalose.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/965942986.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/44884754620.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/geduripukamaf.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gazavosaxunufajolitom.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bf248b6e---97187065086.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/pidomomakanav.pdfIn PDF document text
    • https://computerzone.pk/file/22627534625.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17243 13240 bytes
SHA-256: 9164d04d27b95a29252181875a6a764b47d27af4b5731198d81f27a300046732
font_01_sfnt_off00019df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF9 5144 bytes
SHA-256: ffd7f587ab38c0ae83511d1fd561f34576ad6cbdcc422036b33d5d1e4ef32397
font_02_sfnt_off0001af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF99 17896 bytes
SHA-256: feebcf6b6f5a86c43e499071dbc3e96369c739865916f0f3a55760e75005fbf3
font_03_sfnt_off0001e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6AF 16100 bytes
SHA-256: 82c39602efa5c553827d786419f772ead6cd37265bd772e4eed7c871b6d0080b