Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6202af6a7dcfcc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 17:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbedfb27b5552a16b574880880ae1e72 SHA-1: f3592dce86fc1840d362d7d1af8e0f4277fac03b SHA-256: 4b6202af6a7dcfcc09b343d7c58c386b9d8ab55bda9c680d8ab6b40df5c9deb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=youtube+android+app+download+apk PDF link annotation
    • http://altinay-law.com/images/file/wazufosowofeza.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/24486123009.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/lufirazefikazitozozaseg.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/86184555968.pdfIn PDF document text
    • https://windscrm.net/files/file/fejepenubejumo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53630929715.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/pikubenuxadasutopudu.pdfIn PDF document text
    • https://sim2007.com/files/95950245858.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/golunotumevejetigun.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xizivop.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/powigozufixuxobopid.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/abcaf9c5a38bc41b6dc7833dab3317ad/82941085676.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136033aeffb4---lejironibirivak.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/12521142350.pdfIn PDF document text
    • http://apart1day.ru/file/sawakuwuvobuxi.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/20864277395.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ta29qeejdeegvt5curbv5umdh5/19362030174.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g6thjjg086v1fuig8qsq762bv7/lazanosinonosika.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59a97a988c06fa23856ec416080f6ee6/94842072476.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/960asesjgjatur27rtoi378eu9/texab.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/8667855957.pdfIn 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://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_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 17580 bytes
SHA-256: b41fa858a557284069555ad63e881a29c08306a5651d0e09386bee7edd01f0ba
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10616 bytes
SHA-256: d6e8230c42c604096522706dc2f613842877a075668b5dfeeb817e087bb1b379
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1