Malicious PDF — malware analysis report

Static analysis result for SHA-256 58475ccdf56d9cd3…

MALICIOUS

PDF

85.8 KB Created: 2021-07-30 05:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ec9ae8fc753d07b27ac86dab79e87c2 SHA-1: 3bafc4b33218db5bc013570331071bd0d915c084 SHA-256: 58475ccdf56d9cd37dac6c9873403504bdaabe6ac008a7a2d236e4d5f31f5995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://skkouty.cz/ckfinder/userfiles/files/23480915132.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/nuqkck6umv1buhi0a3qn3iccdq/xumabiwim.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5e1a046fdcf68f3e6beb7bb5eb64ad60/68636534311.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/89123330312.pdfIn PDF document text
    • http://yuha.be/_files/file/gabukosedom.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/51085626650.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fagirimewuvaxiduzob.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b69368631---dubujomuju.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/31795381700.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/safib.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/nagoka.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/4252507055.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/393113a8523527ff08376d3370e80a8f/kogupanojubewedibaxup.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/60365329572.pdfIn PDF document text
    • https://dineflon.com//files/15062647306.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/10f4895ea84d799a5841c588d41dec6d.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd727e3e99b---20362649150.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/69845287899.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/22151908969.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///dagerokuwanuvituxejoza.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9dc870378---40358499216.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zinejejajoruzofixobexog.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160775916cc621---labasofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vocabulary+exercises+for+upper+intermediate+students+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_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16748 bytes
SHA-256: a0fc658fd49a5accbfffc61cf05b3af02f0745373e65abb1d2657e67757160ac
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 11204 bytes
SHA-256: 6d437b02485bb4c6719a77a02f3dc5ccfc4bf56f333205bef783da3d7d084f22
font_02_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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