Malicious PDF — malware analysis report

Static analysis result for SHA-256 6322a9a02b0577e5…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52188e87ead868a3cec95a5b82be273e SHA-1: 26244413ac13dad4ec88a4e129cb6d9afd8b4bf7 SHA-256: 6322a9a02b0577e52c20c66ac6acf6febd9f1c2131feaabb08443a59ac749a0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution attempt. It contains a high number of links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to download malicious content. The presence of external URIs and algorithmically generated URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=gta+san+andreas+android+keyboard+apk PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614360f0cdf8c---31849291554.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/xosafubiloworobupuroxamoj.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906235227.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jirosudezud.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797c1babca---28552579403.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/pupuwajovidezefajimemin.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/14596769423.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///zanovaxe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ft019r3659cq2f452kb1k4be55/zuwenuvotubavef.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/foteput.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/53984161393.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/nejixezobogenizinose.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nagigagabigutazufopiloniw.pdfIn PDF document text
    • https://kopari.hu/files/file/15022376513.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/juvevufupajojezazu.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/9271562996.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/16343542080.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6b9vimr357e6ldnedhhmd7nb14/kevobegimubiwoxukagunikox.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dkr2kn287n6erlj4o0elj0k8m7/nabopomanu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef2719d52---65648083068.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/fuzonugiso.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/wagarupuvenogixuvemov.pdfIn PDF document text
    • 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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 10724 bytes
SHA-256: f7fef97e0a9edae2e3cdc71a7804320f9379f87dc07d0b1dfda9223660a72603
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16796 bytes
SHA-256: 0047109cc98c02f5d34939337b8e809700975309469d3722a6f3923843850a94
font_02_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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