Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e628ca85b41584b…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 14:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2575fe0278c684d224f9c2f455d7fd1c SHA-1: bdd3c9e320cb82e38f04b1a42f95fcce6a95e893 SHA-256: 5e628ca85b41584beb18655a89d6eea25af0e400993227c9941e2246f071fc60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://ekstelekom.com/userfiles/file/janigiditadajon.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1e56f657100f362d9fc5db14e058de0d/bokagojenifizif.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161599e8663b21---jigufokujoxavopak.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/99428961865.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/wedajulukinatales.pdfIn PDF document text
    • https://tuinvandecruys.be/file/rasorulab.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/dekipewim.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/547442792.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/rujijofepepunisuwixok.pdfIn PDF document text
    • https://websbag.com/uploads/files/86031712615.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/38382993833.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5ef11e7af5fd4759f2753a739e26f2aa/kakaba.pdfIn PDF document text
    • http://terrietanaka.com/library/files/45819409035.pdfIn PDF document text
    • http://juncheng.tw/upload/files/vosala.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/76855607423.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/limimobutotufen.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb11a02f61---pajurit.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158775c32de9---12084890867.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/76140573062.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/pakiferizas.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/53711809078.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/fipekebetumixuliwi.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/73302073814.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/615acacb56d9f.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/57292328762.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16430903085.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/10933565509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=find+the+lateral+area+of+the+square+pyramidPDF 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 11100 bytes
SHA-256: 6e2418678c74b9aeba09e0f9c7fe9dfaea8f0488cfaade961bab70bd67ce8eb6
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 20000 bytes
SHA-256: a4991f885a549b5ec0ad05c0dac499ddadcfae0c590fd50f9b72662f2011ae8d
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1