Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd853998df643721…

MALICIOUS

PDF

76.5 KB Created: 2021-08-19 16:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1f93d58455bb676f7abbb546f3318218 SHA-1: da7e2333769500b9c4a47e6074c3b41d6ac32c40 SHA-256: bd853998df643721e56994d9b51fe214ddac9a0d33b44699f99a221d57d670fb
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spreewaldatelier.de/img/editor/file/pekotunin.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeaa76d727---jusokarusobodokuluwis.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///bebajixewunutoxedakem.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/vubowedemunuxejadon.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/06aa93b5ce99873c633e49be1a1ca7ee/55122469562.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/13837347235.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210728_308A10838C2CB723.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1188b4e7d9b0d92057ad394a37f88ed4/ginobamaxa.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/76714441391.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/bivowe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c055e3c7---motuvudulatogebitadopiwav.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/92767854920.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/nebesetosano.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a64f674a9---bidexutuwabawekigoxek.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/lefozanivekunidivunam.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074632c03c29---xuzofadisatutuvomepara.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/53148704412.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/74512314095.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e2657b89c0a9398f7ad6221015cd4d7/jefavudumozom.pdfIn PDF document text
    • http://charontrade.hu/data/file/dalakemijugawu.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/1960505683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gerunds+and+infinitives+exercises+with+answers+pdfPDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 10944 bytes
SHA-256: a785176faa5ee65f75804163588c46e4926d43b1e31cc9ece3b257bb560654b6
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 16744 bytes
SHA-256: 748e201f130d8486fd93a4243760c9e494d5b9f20042389c0f84124729a09786

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