Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d404f9477835258…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 14:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72940c49e0524afcca6df0f7b0c07946 SHA-1: b7395c86ee987622aad44df60531f384c418d081 SHA-256: 9d404f9477835258ed386f5a54964cf916a54e7ff8a4d17f4f8ed4be3f0c18f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document contains a link farm hosted on multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+recover+deleted+photos+from+zapya PDF link annotation
    • http://stlnsk.ru/uploads/file/83024058941.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/gutumaxuzajagi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1ef6ebe995805fc88fb658b73d5cec9e/87790864786.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237d3d4230---ridadirijeruripurimago.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dfcf474b5e1eda26a4348aa414228881/bogesubamakamekamolit.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/98568110298.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/bobedin.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/19137673813.pdfIn PDF document text
    • https://greenways.at/userfiles/file/86802895590.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/67643114721.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/7126602449.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/72460399916.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/kejunok.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/gasobim.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161350e5f644ab---wipilezepusogogi.pdfIn PDF document text
    • http://enricobarraco.com/files/vutos.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/74354155441.pdfIn PDF document text
    • https://kvzriu.org/images/file/jitofageverusexo.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/92048051603.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ketaradabitawu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jiwusigeminesepatuz.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/45644462234.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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 17760 bytes
SHA-256: a425c5d94bf87b0af66330f915d4a80fbf326a8b6588cd2aa3814b57a286c465
font_01_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13898 11008 bytes
SHA-256: d5c6ee2c806036a5cc4c92cea3fd58effe36a3f5fdf6b4c137c19287fcf13795

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