Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d76060bafb9f68…

MALICIOUS

PDF

83.2 KB Created: 2021-07-03 04:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31283f6d92c9d7d09d25f8a64870b2ea SHA-1: 4675e11335e42c26fd9e3a8b29c1a275b4f50c82 SHA-256: b1d76060bafb9f6889240b06daa86a65c503a8193c6b6c4adec03b0efb34a1e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=learning+the+pandas+library+pdf PDF link annotation
    • http://sochi-polyana.com/ckfinder/userfiles/files/57509517531.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/63781310185.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/75227052958.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/legagaz.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/12232257487.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a6ca3c95a3c5c74dd62c714fd57caafc/buboxexelewatupodafako.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/57066333978.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/76fd3d156c447dd2f70ad2f726439c91/bowodubaburasi.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/45604236185.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/73998867403.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b493a9cc7---29244908135.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/df1f703cbdbc2a957ae56fba082a6bab/34478572659.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a57f8761ca5---tugiwugisiz.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/36884723032.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ade6054cf1bdc3a02d4fc461bfa9da0/69063054048.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/katexorise.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/vupemejavod.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/joramar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/aflbth9aao5ph5c2a1l6nnjuom/gonofu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/h5degvngqmmadm9n6kjr7fh7rs/velokimafalifomo.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///torusewataj.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 10868 bytes
SHA-256: 27b39885bed32385db6824a413f1e4946d1e7032351e494e24f0d4dabc5c381b
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 17008 bytes
SHA-256: a44c658298cbbad5e1e0edc909729cb46134dfdadb35be8e6e7716e3f74769ee

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