Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4241518e67766a…

MALICIOUS

PDF

139.9 KB Created: 2021-08-04 15:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 436d8bfd216902dcd017b8eda2f8517b SHA-1: c7b165363891a537afff0df9bd9ad036507e686f SHA-256: 7b4241518e67766a34048b5f4a21aa37e390ef66ec609aa0038b9fb9f20134f8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically a 'Password-protected archive handoff' as indicated by the SE_PASSWORD_ARCHIVE_LURE heuristic. It contains numerous links to external sites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely using a password-protected archive to evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8943

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medi-sen.com/files/files/boledemipidafelazij.pdf In PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ov8v15cp2f5q66crktdgnjeh8o/63290593737.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/57948090241.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e26att3fuqka3nupcsr1s044d7/butoxubuzijuvuba.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/javefizuxutonuna.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/fawifabevoj.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/titukolukedonava.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69865893426.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae8464cb5f---sivom.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/22087513616.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/67069164627.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7abf33a7---bixuzojorizimikakon.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/69334902666.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd8f83eae---xavegifenivegupuxapixuw.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/lilavepipasuwavavesileku.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/60089652637.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/lanetirepilojanob.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/11920060561.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/velagubebobazisexolipex.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffa13f790---91477552107.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20933117442.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20574833050.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/48287995218.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4bfa805d41f526fa2143f0bf1caa2ae/17354658131.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/47939717414.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/31589780288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sri+kandha+sasti+kavasam+sulamangalam+sisters+mp3+free+download+masstamilanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18663 11536 bytes
SHA-256: 017041483f4aaafa8f7fa964597a76ca5f84e46e900da36014b4beee775c4d67
font_01_sfnt_off0001a155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A155 6344 bytes
SHA-256: 652241e0f29e183005bf2c4e63fea6981f71cad889204f84ea860a63d576cb61
font_02_sfnt_off0001b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B755 17232 bytes
SHA-256: 775b4e685de06d79d2cea94526f3f16b006f890575b906830c08c690ea273180
font_03_sfnt_off0001d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F6 19996 bytes
SHA-256: 5020e79e6b4327821a1a64111c6d3b5818c8c3f3deb2b6c23e51fcebbdc899b7
font_04_sfnt_off000206be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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