Malicious PDF — malware analysis report

Static analysis result for SHA-256 f511894d93852f04…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 13:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1361d8a88c6964f09d544fb07d10e24a SHA-1: 25f2f26947f596bff28b89186be985837c970b30 SHA-256: f511894d93852f041c251292728a386512f426bbd6176f8dc2d4faea3117d08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://drafthe.ru/uplcv?utm_term=rooting+and+android+phone PDF link annotation
    • http://www.agot.pl/upload/file/50775909884.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/rusazireluvusobobogek.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1f67c325---zelepekuv.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/72341191386.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613219256b3b1---84341885181.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/96891804188.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/14128030698.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/davenulasa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rkm4gt0mmc7hhk4vehfn2enrfn/gupavejanag.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/87545808915.pdfIn PDF document text
    • http://hanleyresources.com/images/kajonodusi.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/49654396745.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/851ffa7665b24b7e0f2e97e3561aee82/suwibuzizelopam.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/dosiwepesuxen.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/93542891905.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jajukak.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/34095565610.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea41b6f29---lidizezasawebax.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/99325629604.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/bijudapozekemogegenoxigos.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/xutunemilunipamikojo.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/12957655893.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/magekatow.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50399490162.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/56916188259.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909141813.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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10504 bytes
SHA-256: 53a23148c57b4723f57878fb11fd30217d5c68bbaf26502255324a22056ded8a
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 18588 bytes
SHA-256: 515451f463563d1fda99d5ea166175ae2acffe25d39ea4fa721470809fc7d2ff

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