Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22520c84f502d62…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 14:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 895ae1538a4e2c139934727fb9f9d1f9 SHA-1: 9b15dd4d50c0f293c7be669daa5511324fdb194d SHA-256: f22520c84f502d623c20c4fc12ef4c87bd9fba8fa584237e229a67be305efdce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users. The primary purpose appears to be phishing or distributing further malware through these indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/3e24f3c7e9e0e5638255cd1b49e4354a/94233372830.pdf In PDF document text
    • http://abogarestudio.com/userfiles/file/55893816579.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827be6a5003---27814654089.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/85986228720.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/htljvjlgk8d8lntinsh3s9n0q0/sawelisulogoworirepux.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077406fcdebf---21752680354.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/76aba6f34293a9ed5c43b34e78f4362a/xejujub.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef928048a---mipufefiruwaxububi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/gatexape.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609479659e3ee---pijivuxidoxu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609712d18cb11---4825660227.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vijifavaxuk.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fc58a32d27aa0bb86e558067a0f1c445/benurexofavotemazaxodu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rexogexepakikif.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/84079144296.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/27482030252.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/80877793565.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ginazopig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kuvabojapufegusulusak.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6956952386.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eaa6913d1---zetawe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/322160133.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9d7c785657dbe02639b0e11e05839254/85174539569.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/82495612469.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079348647aff---topipomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=feminism+and+sciencePDF link annotation
    • 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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 17084 bytes
SHA-256: 82ee00707ec57b9c26a8b1307a31bd639bb37e48d45584add527b658ab73a835
font_01_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDE 10144 bytes
SHA-256: 307c63a5e584dd06b2904906d0cf74b75424892b06c4c646b53239cd5099e2ff

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