Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a850bcb4b0ac8e…

MALICIOUS

PDF

88.8 KB Created: 2021-06-13 07:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a83316c4361137821cc54569bf962a1d SHA-1: dea4036d509681ec77a351bc91f43fa13d2175ba SHA-256: 84a850bcb4b0ac8e68ffff1afbf1fd58489972736d66d14cb04cfc0402d34728
156 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=download+sunn+raha+hai+na+tu+mp3', are likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=download+sunn+raha+hai+na+tu+mp3 PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/48582abdc41c442fadbc713d3cf554a7/lozupudosoruxoresij.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d954386d---64511842515.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd949cfcd3---38640733439.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zisunovi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fh04ibvb56kg59p1en3rrh630e/38601587811.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/febf122b6310e0d03ef98195fcc9b42d/bemazagij.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f3dd204e103f74a195c7473c073f2b6/35535297752.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160900cd570575---puvefazemarim.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c468c433d7---vejumibelosawux.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8427785b9b---33653155331.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/57560687871.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081700680a3a---nogedojozi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/576d7186973ff99ec776a578fca769ac/kewepinobon.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d384487ff6---damamunuwokazunow.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2f3bef5d---korawowa.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7119a374---tirilawebikida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 5456 bytes
SHA-256: bbeadbf6aa0de80cba0cd2b07d24b786fa3cd29ce264fa253ebe4ef47cb546af
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 11916 bytes
SHA-256: e0b8086528b4fffde882388d6c19068354eefe23f231d7cb08c7571dd6c1aa65
font_02_sfnt_off0001428d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428D 5832 bytes
SHA-256: b592e4a39ebd7cb75617ef58f0f0a16c6b708492f8ae899ea4efb87d6af1d7a1

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