Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2ee7bc98c04ac8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 13:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77dac25279074f45014585471ad5e56b SHA-1: c5304768e39474cec62d937c4fffd1f15533b79d SHA-256: 6b2ee7bc98c04ac852d587b9ff17d0d25b3890f1029202c6c13a9684558d5023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF's structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crewmak.ru/uplcv?utm_term=tipos+de+planeacion+educativa+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abeb4dfac3---78275794816.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/60180283169.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131afba25607---68864484479.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/vomafibusat.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/bijus.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/38eba3f40b15d00d4af79b6ec647909e/lesapowetetetonefowu.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/65418056359.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/mitimedulovijalol.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/65419423648.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gvcrpj57jlh8p05i00nhdagra5/51985806730.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/satikoxuwogexuxebozosaku.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/nujebapo.pdfIn PDF document text
    • https://serka.com/serka/upload/files/32558735314.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125e4c19a3.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/58968444441.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/51510950483.pdfIn PDF document text
    • http://12shio5.com/contents/files/15391597480.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/miviromatedajinijanijof.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/60331255486.pdfIn PDF document text
    • https://mavibusiness.it/file/81992707442.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/fuvojugodupewowizidoponat.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/jubivelotope.pdfIn PDF document text
    • http://alvitraders.com/files/528715430.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/zuluxexidoxebapevenolax.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/17364233382.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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 17084 bytes
SHA-256: 043952651e59f8e0303e0fdfd645b16f644462686f4d52fb176b7baacd743e6f
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10640 bytes
SHA-256: 84bbb788fc3cc594bb0d670286094ec50675e2253d3173b1f49f3f444f223039

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