Malicious PDF — malware analysis report

Static analysis result for SHA-256 377695861100fb1c…

MALICIOUS

PDF

67.2 KB Created: 2021-06-06 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4c198e1c32ca87c3ccc5bc7e60971254 SHA-1: 4c6ee54f9608131cbed8954c926e6625c7019b48 SHA-256: 377695861100fb1ce6c19157ddb87a48acc13b1646a02338e60f5aad0eccd07e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' and the presence of URLs like 'https://coretry.ru/uplcv?utm_term=is+my+boyfriend+trying+to+pimp+me' indicate an attempt to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://coretry.ru/uplcv?utm_term=is+my+boyfriend+trying+to+pimp+me PDF link annotation
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/kabvj7k43kqvpcmdhdrnml02i4/33527907699.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/705767dbc7a6129372d5b090a1f67b3c/22342827212.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mnd2sgtu9r87hv4j9b70qfqch9/zukinurizebabafamibe.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/soxigasika.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/64261893968.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8298927005e910c991b458b15d0500ff/4040311753.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919f060a61e---pizaji.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/negixubudewubavax.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/43749834652.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5m1eb7cdubdrq6mnfg2mg49blc/vivijoxaratenixonuxi.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/31728615130.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf459d604---83684687008.pdfIn PDF document text
    • https://www.propertyadvisersauIn macro / runtime command snippet
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF1 5296 bytes
SHA-256: 77ca5efe1736a13a430f6c661e0fabba7c05ffdf26223f9eb33caee6c4fc7128
font_01_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 10628 bytes
SHA-256: c7c74a3114fb906b9b8336cb0f4bddee8507146282a43336588ab73a9a8f99ee