Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7543655146dae28…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 15:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee968285eb090a1ae7b9a324fae6aaed SHA-1: e05a2555919950a2fafde647ea082d2f17fff2c3 SHA-256: f7543655146dae28f04dc11c7ebb77369b4e154deec26462c8f0e7ce63730ebf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to direct users away from the current document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://headlinesdinerla.com/uploads/files/35586315102.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98f225c91---33125885768.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021610d6b4---pejinukutepegusava.pdfIn PDF document text
    • http://imoroz.by/upload/file/pofomuvajidav.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoboxopexesuwalojageliz.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/winop.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/19463041605.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614815b7db8f1---nikazalexadudisavofe.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/bolijiposiwisetode.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/69405289754.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/74813806629.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tunetok.pdfIn PDF document text
    • http://orthopediedelft.eu/files/18775310379.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/jeneli.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/menob.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/52252165920.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/64185351558.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/78608020591.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/9819532389.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/wadawunapi.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/83083062414.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109140442028469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=messenger+themes+free+downloadPDF 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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 17888 bytes
SHA-256: 20fe5cf03dd7e9ace8443f86781e68effafe58de02f00d6f1949db33b138551c
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 10788 bytes
SHA-256: 54c0c321b77ff4457a0895253a1705b97aa312be9226fe5dbe7b2249d5ece4b6
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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