Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c45a570ff152fd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 00:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be3046c1b4b79631fe94a463703a655d SHA-1: ae1a0dd2bd0a4250956b26a2889e830ba7c7db7b SHA-256: 27c45a570ff152fd6544f461ce60e49b72ab3ba67294d38a21961b2a9211a0e5
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass security gateways. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tauthuy.vn/upload/files/womidexepas.pdf In PDF document text
    • https://andrejc.si/files/file/56854733032.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/96855584019.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/pesukojorekexabonix.pdfIn PDF document text
    • http://rsentco.com/upload/file/74578629399.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08ed4eeb9---fegikidanalaged.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/14804044294.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/wenazejeparomas.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/nivesivegozurakomutotij.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pagoxin.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1tjvup7ksf81avckbtvcvadjb1/femogavuwusasebolawawado.pdfIn PDF document text
    • https://aksusu.com/upload/files/25501330863.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020724014251.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/garesoderiruzoluwopebak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/juwurolesexoz.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/83441369689.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/89882790132.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/26948590942.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/zukuvisaxe.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/68875202324.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/3771622301.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xawojopeduxifogukad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=office+365+imap+smtpPDF 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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10768 bytes
SHA-256: a7a113c036b0a37d859b7f3e767f9d5b14247e778de23347b512fe0710b39bee
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 20640 bytes
SHA-256: 694a647c4ac39e0de0930488f44aefbd950894e855d8add629460c80eeb654c8

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