Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff900e89b9ae6a30…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 13:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c86f4c8dd0bb470315b9cdb36cabdb9b SHA-1: 212b4206c3c0d99691fa471fe1d94ddfba2923e0 SHA-256: ff900e89b9ae6a30654bcb5ffe6c79738f0690aab63ed3ab76f735d5f2ca702d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a deceptive download button, suggesting it is designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=safe+free+pdf+download+sites PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/m6drsbh0to486j7q2gokppj3u6/90014128581.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16128f5419fc12---73229879972.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/21811850401.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/titetitodezu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0911d27e15f277bd6484a35a1ff77478/xorazivajivuw.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/67955470555.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/jnt5umdkhqbplm4oph95pmgvl7/jumetogapakew.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ed39a6f45bd834452810f6dba02b2c6c/janutanosadigon.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/75028233738.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/raxipedusivedidakode.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795145acd8e---33804955931.pdfIn PDF document text
    • http://scantech3d.com/files/92586538848.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/zelemusekofanowavow.pdfIn PDF document text
    • http://goldia.cz/data/file/45443630812.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/16106943381.pdfIn PDF document text
    • http://esistore.com/userfiles/file/lolulage.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tuxafebuvuvuxiv.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/67025046465.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/eaca600993e906a8795aa70eeeab9689/gepixajadejobobutax.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/96069790247.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/9748d0fdc910f6a6c4ca76a89a162823/23201061134.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7af3fc3851d461f08fe465f10b4ec1f5/21717675428.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/64918791450.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df003ddf4---64235799903.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10652 bytes
SHA-256: 373ed5e3b8a24c7b03e23a95b3d27ccae30e66be7749d4bd6eec4aa6ed214311
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16940 bytes
SHA-256: c1e0a8f83a86d035a6618a53349e607c44d27219a065e5f20990401844b3cae1

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