Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30799f680f45893…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 18:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0ed232436f2b0c2926fc4eee33edd6c SHA-1: b02b90a7b2aad95cbad2a70d148dbc41e4ae2674 SHA-256: f30799f680f45893d15f951f9163f95a019c1686f6120ae2cbdb1bb910d54880
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting it is used to redirect users to malicious sites. The primary purpose appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=rog+phone+3+hd+wallpaper PDF link annotation
    • https://menlopark.com/wysiwygfiles/file/33206471591.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/sokusuwebutatojajago.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gukopazimit.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fogevopaxupomebetaziwukis.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bakafumebegima.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfd868ae5---pefunogodejekexoxi.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/mutitomevidajogoxijikulav.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/makamedukonepi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae7b13444d8debbfa999a4a60aed4148/69981845620.pdfIn PDF document text
    • http://peoplefoster.com/pliki/44036897393.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/5259185094.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210913023732.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/3694168924.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/8387973403.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/aspl40irk13ntnkevt6qf33k6c/43617223173.pdfIn PDF document text
    • http://teifsepahan.com/files/file/98792210766.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/lodaromajarubiwaguz.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/takitu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-21/20210921075720317319.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/nixikotodupekobir.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zezajedopirusav.pdfIn PDF document text
    • https://kawanmto.com/contents/files/54740012299.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/bilox.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/99432350776.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/devawetebabuxo.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/dusobezapumojefuje.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 17900 bytes
SHA-256: 198098c77bb71fd28d75e8d9053f6bb0d200a978fed87125badb1c8ab996de9b
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10616 bytes
SHA-256: 1afe253a1351df92ac06ab487e4074aadba5b7c75f52045722cd062dd4851864
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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