Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e8515131355fcf…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 20:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3efd27a19ee3b2746d39baf9464ba162 SHA-1: c6d46d19ea8e48adcab8568a04aae8d04f7b91f1 SHA-256: 88e8515131355fcff4679a81bd653d748d5b48d9d9fd0f49bd8214f0d8f7b16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eclearusa.com/images/file/82023088382.pdf In PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610c19298b5ab---zirokamamuduba.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9c57mk73jhnkqpuefeoakeelb5/54182815548.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6695eadada---83895730138.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/jumawawodukawifewiz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ab6aa123---51643979751.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/josolitopumetugo.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740baf97352---pafev.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/kisanokinapasa.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b107480d8c0b3ea91a7fb9d752f86aba/melubikegasak.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/21aab213d0226561c7ed614f04d8b593/xawiwelomupetaluxovaxoral.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608285042d304---luvopubiwiwe.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/84413452890.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/69891059224.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/37391529383.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7b1a9b79---bujojelozozunazobe.pdfIn PDF document text
    • http://elma1.ru/!upload/files/zoropokotusala.pdfIn PDF document text
    • http://skomi.ru/img/files/file/91486117079.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xikuvezolaka.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9s0cse9ina6e1a734grcleguc/42180085686.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/fulox.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/58geiqqalleu3b230vmvao2kpd/59901719963.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kegujazuvewevaximosabube.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609129fc209de---xararidusulizilimifedaved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=plasma+rico+en+plaquetas+pdfPDF 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_off0000c356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 16264 bytes
SHA-256: 811e6ca9dce786ba5caef469c04a7347a212c2e22bcdab0538ec85a70c2e24c2
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 11028 bytes
SHA-256: 7232c0142e45de789320edd200e7019cf2d176cdf53a3e00e3dbd450984a6580