Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cfaf18b05a48a4…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 18:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc2777fcfcdb12666c66ff4ba027dd35 SHA-1: 00b5846c914bc40a2cd81c5ccd8d65ad947b14b8 SHA-256: 80cfaf18b05a48a412b7ce747b69807e3c1f1d5b313d0893d80c45d40b428392
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting an attempt to lure users to external malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://tweddlefoto.com/files_contenidos/upload/files/74562086647.pdf In PDF document text
    • http://karinameal.ru/imgdish/files/92088993460.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/26132817341.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/97116589724.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109260920496463.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lokaliwopojupekejarelu.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tujebiteripekevutog.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/27858705124.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210927_FE371EF0CCD34100.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b236854e7---41036332421.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/6004659699.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jaxelerevifofowozagubaj.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/25077692550.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/22537372422.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/7837261169.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b832f3c7e5---magagofibisuz.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/miwisuziz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f6608bd2f---35279668308.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/56395358409.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615867e616183---zutudavumosorive.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/movilelalonuneb.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166b408073---43791625562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+answers+to+logo+quizPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 10772 bytes
SHA-256: d39ebc60aedd6d9fc7200613a99e2b31ecdf2de350384139cfb97f463d48fa17
font_01_sfnt_off0000ca4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 16908 bytes
SHA-256: 9eeece7f251b6428447fe2bb061aee9726d4e62d9f1ca96e7715a52f238b2b28