Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3396a460045cb8…

MALICIOUS

PDF

78.6 KB Created: 2021-07-30 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fa124f1d71f7a027fc7fa7165f0430f SHA-1: 19de96240e996d6bad90f2aee29bbc9a30968873 SHA-256: 9a3396a460045cb84f58566cff55562ab3167cbe9dccf9804f83e14d9ef77f26
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm rather than containing readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://nedirajtebosnu.net/userfiles/file/zamixufezoxotogifesi.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c539e4edf---liretivimubuzutubat.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379918513b---28382223690.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8b659abc---mevuwedobudo.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/092cf289a02c4acacc5edfc5082d34a6/tuwiseduzunebukazedes.pdf
    • https://www.domosystem.gr/ckfinder/userfiles/files/zisojevutazudoxoj.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4790aef91a---9678053271.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jo0g4l0smkne4d5cg6unpimk8s/90335876580.pdf
    • http://caphegiabao.com/upload/fck/file/11069901349.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/5026339024.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2583c0608a75909244422cab5e24cfef/jugasu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83f879ae1---ruxemabazifewabumeduxux.pdf
    • https://webtechnocrats.com/upload/file/10108938395.pdf
    • http://baigeleather.com/userfiles/file/74645479749.pdf
    • http://asijskepotraviny.cz/files/file/tilubaderigavidepuda.pdf
    • http://stin-verdon.fr/assets/Image//files/71726369853.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd01ac44a---76977021903.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d4e959fff9774c61b0f25c6f440e496d/15081077779.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e8ba88f0a2629a1cb9d00537fdc28d86/likomafutegudogiwe.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd3010587---lebozurenuge.pdf
    • http://sungsam.net/userData/board/file/6562857875.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ab326adb---movajelumufijevu.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bdc7aa2fd34b0f3085a6d97e885be665/viwubosorozelurarovekajor.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/537daa282fd7c326b294cbef3e780349/somadabawadutusubu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bright+starts+swing+how+to+use
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6f.bin
7080b079bac54ffb4d8b533a2fb4c128f7bd89b831650636d8c22a5563e1e1cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 10580 bytes
font_01_sfnt_off0000e7a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16792 bytes
font_02_sfnt_off0000ffb9.bin
49141c41c305c79ea0cec5fb18cb8a0b3dfd1d0fdc96c914e50221f2bad7fb10
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 16672 bytes