Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f9947388ca8db1…

MALICIOUS

PDF

91.4 KB Created: 2021-08-09 23:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dfda5084cfba7ebe08de0cdbe62077c6 SHA-1: cd91ae817f77be38211ac453e156b7c0874d4c9c SHA-256: e6f9947388ca8db1835b8dd9678a6331b87953b3c7cc8d8755ceae8676b73d8d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and the presence of many external URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=el+mundo+de+sof%C3%ADa+resumen+por+cap%C3%ADtulos+y+subcapitulos PDF link annotation
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iu98go3vo868qsevr6on0o4qb4/vagazevukebadovogafek.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8976d3f97d---zadunin.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fd09e527---36803571359.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xojunefakivagatenepirix.pdfIn PDF document text
    • https://hsse.cl/files/6291158244.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/18664889532.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/95108962395.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jabopipatitawegazulotazur.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c5b9d1d3---84034696106.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/lagefolipizovokogi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/rdej17vkg4k9eh1r8mjerhpt3v/zarobulixonodojeja.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7d3e92079---90757023033.pdfIn PDF document text
    • http://regmac.net/userfiles/files/dinisuvesepinudidijokaz.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b011451c92e---23478152318.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc54213558---wanisakojosezeludixi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc5c6f7d3---63266304708.pdfIn PDF document text
    • http://chongros.com/userData/board/file/60344119859.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/76114984073.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/3369483079.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/lagijuwoxifiw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7c5d8b0c---44032298513.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6850df1fc77102aa686f1e8d0e16358f/rifunuko.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab45a25d11---17025088113.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f256bb38d---77760046119.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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 11180 bytes
SHA-256: 2ebb2f8065fdb0334803461628b982d88fb7db691e56df1bd21853f3ac5c29d0
font_01_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 18648 bytes
SHA-256: 2e5453623093f55e8488368e814a8f66dc8b2e65bba051596b4670b4e894d45c
font_02_sfnt_off00014415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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