Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc19b0ac907705e…

MALICIOUS

PDF

86.7 KB Created: 2021-08-18 22:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a235b18dd3527c101b269f9d50158c3f SHA-1: 454f75e9480318ef28831407414985e01af8a415 SHA-256: ffc19b0ac907705e57d414deb306a3a97e4e207cad5e0ad2d024b3b341e1c0f9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the linked URLs align with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad2a51cbf---susozabatokasagujowuro.pdf In PDF document text
    • http://babijie.com/upload_fck/file/2021-8-9/20210809234209752064.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/81433014925.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c71c406b0---4448565735.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8ac585fdb6cdf664d8c0c9f2d3aedca2/gadaxefezowexudadivoro.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/suxejilikazejesabavisowax.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/walorenikaja.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/nokujenabagezavipinubur.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/18652767904.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5fc220298bff8aafa779f9fe10eb895d/perinu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/036c703244b3ba2eb9d22417708c1283/wawulifafedulixu.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/71586378899.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b754a7d21---movodukumelodafado.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/47739518762.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vigexixemofizagipepazisaj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdef5e0bb---xitodagibarew.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/fumesazoduvegurojew.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0d20a808---93930196117.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/72306827276.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b95f5abf170---deluwu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/29550713683.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f53ec42d322---51593854147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hardy+weinberg+equilibrium+problems+ap+biologyPDF 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 17592 bytes
SHA-256: e6148177247908e44ea7928c82014dbd5fb9a0dd9739f96069b754ab1f0479e8
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 11216 bytes
SHA-256: e92d45d8e546e32e2caaef45a7efc9c78e3d6f122f668734aafd5abc09821778

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