Malicious PDF — malware analysis report

Static analysis result for SHA-256 7998d21328ca76c3…

MALICIOUS

PDF

75.0 KB Created: 2021-05-24 11:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da0902cc749332a1d1668c61acd8de9c SHA-1: 96a5c3c7ebe55e0628b545afc60420980af0f20c SHA-256: 7998d21328ca76c364327a8273b13b1211e8e1d2b99a01b3b1658bc37c9abecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and link farms, suggesting an attempt to redirect users to malicious content. The document's apparent purpose is to disguise malicious links within a seemingly innocuous theme, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/au2a24u8ot869hb7nv3tof3q84/54442360067.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091612552652---nuforejojajezu.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c213b7b295062abdea2807240f43f232/40255681124.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3otht4516ct7rji8dg3nsdbkj/58749233097.pdf
    • http://onestudent.dk/userfiles/file/furepukupat.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2e05537e---wurutusukoledi.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15c24600f---32805516353.pdf
    • http://suamayin.biz/userfiles/file/fupiwatisiv.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077982cb9aed---50247482027.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098425bdde81---popogigurejiretujuposuso.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/05eedec95ffacacb94128eff5d1272c9/6811461303.pdf
    • http://aliceinformaticasrl.com/user/pages/ganofixatupogevizitozuf.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8bcda282---85780628342.pdf
    • http://foto-klub.dk/userfiles/file/2870920610.pdf
    • http://accronline.com/userfiles/file/goxebiwizamudufaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cursive+writing+practice+book+for+kindergarten
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e800.bin
e5a181308b84c704f9bd46bf45d483e4ea3596fbbc2d4f6fb111a4f97fbf0441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5552 bytes
font_01_sfnt_off0000fb03.bin
ffa8a897c46a7a1a26f50acc8b81638cd523dd467f83602d5f69a23312bd663c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10424 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.