Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc59308be1c67bd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 11:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3a725cc93de803e66df42058fa2f311 SHA-1: 7753198dda3aa80c382e73a56cad2b343c155ecf SHA-256: bbc59308be1c67bdb6ab22071f1d8a84ec121e2254edc25dfe9104266caf17e5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with techniques used to obscure the true destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ofly.om-digitalsolutions.cn/upload/files/kotusategokitoralurilu.pdf In PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sidedewaludibukivasopo.pdfIn PDF document text
    • http://secretinvitation.net/images/files/92206378284.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/8643070586.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/takabo.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/29651138887.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53171450781.pdfIn PDF document text
    • http://pronobile.com/catalog/file/57734881290.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/verarejodarelamu.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/66330232492.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8a0d3ef35591266ca636d08c41471971/34128154730.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jutudef.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc1c5dac6---32358885986.pdfIn PDF document text
    • http://candientushinko.com/images/file/56957640274.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813fdd57dc---37466815242.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/17639755024.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/rimedovuwatoxozon.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/guperola.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34870585839.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/saniv.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326279c0695---damerij.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/30027493220.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/zapafemazejawopi.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/50310868871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=voicemail+to+text+androidPDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 18360 bytes
SHA-256: 349838a0156a5cae9f4d349a3823ce1253726ae2e0dbe64139358d392fef7ade
font_01_sfnt_off000116e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E0 10432 bytes
SHA-256: c9b11ffe33933f79213b69d8cc7b79af574e00c4296ff8195e0f6b856f9d90a4
font_02_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1