Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16f0e6be0a17669…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 00:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77df59e27300be0114c137ea2a4740ef SHA-1: c2adb38eaf653a1fdfbe74452466c67c56343a1e SHA-256: b16f0e6be0a17669e332405ed5b1b572a8ab9ffcb24ffcc329daf1f9de4344bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a link farm, with many URLs pointing to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=android+11+quick+settings+3+rows PDF link annotation
    • http://www.atsamuihaus.com/image/upload/File/rigezovu.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/lunefidoruw.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/91352670173.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/fonepewunik.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/gawefozuzuwib.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/65713700885.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109151623147189.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/37259845214.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lipefofunofe.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/93633071095.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zajalix.pdfIn PDF document text
    • http://lg-palette.com/upload/files/fibesafofime.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6f3a83b6---metilikaj.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/28930115065.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/tesaminanabuxowi.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/32499209590.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161376e2d46a62---guxupimalapinonawotewire.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mr79h2um1ofophso7rvma5iclk/54758050190.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/waxotuxalogadob.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/ruruxowepavunigudafanami.pdfIn PDF document text
    • https://porfic.com/fotos/file/xekubizum.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vewavudes.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/59602119923.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/93053019035.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/20112174714.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/9721744687.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10964 bytes
SHA-256: 9240b6e9a86eef45c890eb0474a99bb6ab3f45a76b03eecfb1887069950e814a
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 18244 bytes
SHA-256: fd4ff0d4d7f7606187b9ea2951fa086d3b2a0bbc8ffcfda9568c170556a98656
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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