Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b4756ce9aea846…

MALICIOUS

PDF

92.6 KB Created: 2021-07-02 17:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 861b179c88181f4aac69de99468e603c SHA-1: 4336ced20b2bef4ba39684bab83b9e94208f91bd SHA-256: f4b4756ce9aea8467cd6bbcc696f5d1540628b4c1638308fc187bdb5493a6207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and does not provide direct instructions, but the presence of link farms and compromised hosts suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://urbanlivin.lu/userfiles/files/84437378747.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac122d1e25---68000541406.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9eee105e1a43903819aa644c8436a524/bibazetulotopumudurolo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/70448659362.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516090604_1387626517.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/94397768504.pdfIn PDF document text
    • http://landia-print.com/pdir/file/43616812932.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/zakejabunevazegolotesa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oou12557n6s3193360egimqs67/midosexolu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac963ee852c---88774772432.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607475eabf771---kerikafaxetowemox.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/fufizafixepogin.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/bozajaxoroku.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da22a84cd7---guluxi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ce99f68f---rudofuvejubitupubad.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/78393614182.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v0j92766nvgnv91cmg3b1t1u1a/99301310269.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d533e7cf9a---xadubizawafewefikakaju.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/b67c3a3p7tns4g71519unmfb70/wamunezalifowosamoguwuv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc212f7aa---vurilolazeg.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3ff04ef16208cfb23a09c5fbbee3ac75/kijiduzeritaludijuvifas.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1a28c197---sonupewidurilerarogob.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ac5d5c07---85936605545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shar+pei+bulldog+mix+puppies+for+salePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 11160 bytes
SHA-256: 7a717a6ae27631d5c27ea2e3881206268b9df8d0155b3d2c85211edbb1b1e070
font_02_sfnt_off000138b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 17092 bytes
SHA-256: 992122327a920cc73c1d2964caef2af80caef3996d56d4fc4826ddf1faec3829

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