Malicious PDF — malware analysis report

Static analysis result for SHA-256 570a1e28a5399446…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 03:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80a420949b812af0103b8e7482a3456e SHA-1: 3cea5c02e449ae7046ede0c6bf112039b0d0bd9d SHA-256: 570a1e28a53994463cc96950d6d54dcfcbd4fcab039951c21ac12efed030544f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bulongvungtau.com/media/ftp/file/dexumubewebuwagoxijut.pdf In PDF document text
    • http://lustigersteirer.at/userfiles/file/rafedidapivixedik.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/61844189904.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xexanobovawuvar.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/51192706462.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133578bdc23f---badatizuj.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jumoxomomoxawo.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/5210417374.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/zijezawewafobuze.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/94679180159.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/virewipidoguxexe.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/78030451362.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/todivejepiki.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/doxebunomiposazelawuni.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/zozuridomigoxafuker.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/medaf.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613458fb74172---31259489581.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/fiviwam.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/xowemaxigibitofufufur.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ligubewufo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///buzikixiluwodikiwijewul.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jovolotupuwenukatulemivo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38c2528078088c3808b0e7d674edf614/zizisagodetoxute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+the+last+cruise+online+freePDF 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_off0000ae3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3F 10528 bytes
SHA-256: effdfd3b6947cb7332809282fc2be7b090576215b2cf3ca68287ee5095e7ec78
font_01_sfnt_off0000c635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC635 15432 bytes
SHA-256: e35bb3fe38d7602289bdb2e06748b8ec3bd55d55aa16638160861635b0efa020
font_02_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1