Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0516b2823d8adf…

MALICIOUS

PDF

81.7 KB Created: 2021-06-28 06:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f653f8f9edd0dd2cd52bbdc7183e7bb5 SHA-1: 827f0cb820c101d1f1dec68b816d3549aeb461cf SHA-256: 1e0516b2823d8adf97f50db2d65b45002aa4bc9ddf01d50044f13f3f6f5b2a49
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to host phishing content or malware. ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier clean score 0.0170

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/704fd9b75551d9a62c7a7a86e2407587/42654390882.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160be563c9baea---riwube.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/49149195603.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/069f7e6e6818d95a8b87940883ea09bc/63314015213.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/47381466941.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/49697217756.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wimegapudozunamavadisifa.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/08b10a2a645f42dc6465c2337602f9cd/10688679546.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/97oi7qum9307p903jvu7fbvjfh/18097660085.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/mudakepi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301a72cd---83549216335.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ec379c67f7eb6382d5a0326c496ee1c1/16207784400.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/jafajasuv.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/41428909059.pdfIn PDF document text
    • https://ecoretras.com/file/fodojewelipitizirapizo.pdfIn PDF document text
    • http://shophouse.info/images/files/zudanubutobifatupuvekekal.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vbsd04eb724on41komrkjpiv6v/5167558588.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/378f5e17b247d6fe2fd0c7ac38be8a9e/duxugenute.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/84451852046.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/43205246047.pdfIn PDF document text
    • http://huiking.cn/uploads/file/302207546336.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/jewojotijafibefigeb.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdabceb89---12022861895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=use+indiscriminate+in+a+sentencePDF link annotation
    • 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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 18176 bytes
SHA-256: 79f7e3eae58b7a209170d809d6f7b3193d08a7a74b731f2019f345f988ef608b
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 10372 bytes
SHA-256: cd42b887b3d1bca010372e44f6deca93fe840415d66ec1cc10ecf9aaed3325f5