Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4564ae9bc766a5d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 07:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94d5ed7c4d64b1a76fc9a63a87e3d09c SHA-1: b55ce8d76a339bbc6c658e56b4bb6540c1c15391 SHA-256: f4564ae9bc766a5d05bda426e41439bdc0e86ef07ebb2447e441489616caf7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious content. The presence of multiple unknown URLs indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161369225147ea---94613395874.pdf In PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/55222295350.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161325687706e2---nipeva.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/96234924147.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/1363331414.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/60055724783.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bec997e3b47c397f81474dd82b77c268/97139832635.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/88667187092.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/runesefetuwaxigufesefaw.pdfIn PDF document text
    • https://apra.pl/files/file/kapibari.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/63701768257.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/93411217519.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc69dca63---98503537859.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/xefufoxiwisegijodexovafi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a6e1b8e7---62194493823.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac89536a1---mawanenomusatonuviduvu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zinifuge.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131907585429---81967415319.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/94658037094.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/duroluzidasobil.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/29529265974.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusefara.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/worinosojebaleramijevik.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1d5994939f53529f44c6c894f36fed64/dujatosorulodup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vaseegara+song+download+mp4PDF 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_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 10680 bytes
SHA-256: c6bbab014d5b410f92dd1d5f3f483e59f8b9f39fee7d6429f189dae41582d577
font_02_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 17608 bytes
SHA-256: bb0b4c93278ed72bb5094a211e8e2a47724b9256b88b15316debc2fee01a9424