Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64cc610dedc26b3…

MALICIOUS

PDF

93.0 KB Created: 2021-09-04 21:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4baced55e6d17fa89445c652c721d0d4 SHA-1: 021a0f1e3ee61359532d2923ca2e96088821fd03 SHA-256: f64cc610dedc26b33f92312b826490f633c325e30fc1f90841c236b8e0513877
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e3u33s5tp315nf4ruia3u794g0/99714895388.pdf In PDF document text
    • http://one9five.com/userfiles/files/32834588591.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e3e23619827e5c38c999e11b7a759d6/40932910037.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/26352362387.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/kajipagujo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef666c9a3a---16914090884.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/66152243132.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/mupojirolivifejesuz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a8a9121f82a9b759283bfaa8c7633a05/walarajes.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lelerekasenavodolorino.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/sozeruvowiwipotegakesurat.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-7-30/20210730194611566242.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718665bda34---kikok.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/sifizokafajopoforajikewit.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/lojodebebojigodanasi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/os75pblf9jcrbacl2tobnm7tur/35391286746.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0026a2f8---xaxepidigat.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/766939808.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a12a4427---fujapiwiriwe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c8970e734ab43d6bcb3727954958b773/telemovapekifarovebu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9bavg6vpkgojg9lm1p2ipm2lb8/22891318911.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/gajegubiralozefidor.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d6c01e121---16752654355.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1611a290a8cb21---33048287209.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/10442937610.pdfIn PDF document text
    • https://superchills.com/userfiles/file/nuzepadofoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cabelas+catalog+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_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10668 bytes
SHA-256: 4975ba5cb0b16d82f11981ec8b806f26821248d38ccc1b93d6a8567548ea3c77
font_01_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 17784 bytes
SHA-256: 19219e5a920740e0a4646bf590c0ccb9d049b62c7028d6812c6b9aa7875fd685