Malicious PDF — malware analysis report

Static analysis result for SHA-256 493c865d14adcb90…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 15:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31429aed13b45ee5af1fec0a62cd2073 SHA-1: eee98690ed29eec20618706d07cb7407f7c52363 SHA-256: 493c865d14adcb900463ac7e569a6e9a8aae5146eb16f37bb66b6cb74f0fc7ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d145361b---42458705644.pdf In PDF document text
    • http://rockpapersun.com/upload_mce_image/file/88447345664.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/sopuburexuxosorudizeme.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/26782384948.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kogirazofekag.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/3838153428.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/42623017617.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nuvulotuso.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f90e125a---midotepimuxewosatibe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d561bf9e7af585a73926c615adfaa1c7/9323928859.pdfIn PDF document text
    • https://yorapp.it/file/guner.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/68066111789.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/m5e3fekali28fsj0v37rumfqk2/44608196732.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/57071961759.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8d792ce5---42855472446.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c9f3d57b---gamasilixutivanopovo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/61e4vmdgs53r7kfvtqdicqmu0j/karejopan.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lomemenugixix.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/1244360289.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/12241156132.pdfIn PDF document text
    • https://rcot.org/userfiles/file/86577610623.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ea711424439774ff4eff636671c554b4/6060135836.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d8bd7f2dc---29276184396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=advertising+definition+in+marketing+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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 10936 bytes
SHA-256: 1d3c74a5a551dc6a621197e66b8597e46c58bf1ad98997fda557d470a18e74a6
font_01_sfnt_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16196 bytes
SHA-256: 8be4ee99e4e1fb96321032acf8d2de02866d0bfcf63db978bdd822d394ce3e8b
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1