Malicious PDF — malware analysis report

Static analysis result for SHA-256 6740f0cb0f8cc98b…

MALICIOUS

PDF

71.5 KB Created: 2021-07-24 14:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e619cdd544a730ef1102601f3ab4072 SHA-1: 7f0c09466e334890fcf63c18747ed67ceb00dbc1 SHA-256: 6740f0cb0f8cc98b33f810652e52e16d09e2d7f519ee5a06839594a49822b6a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The presence of external URIs and the nature of the links indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909e4e080e2---28610611954.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612b11a3a0---benewa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd8c6ac76---18172598571.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/54254843005.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/17619123493.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/0bc7f0626a89e2aa58aa3c76106400d7/gopuwijemovamozaxogefebiw.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/80915607932.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/62828614977.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71a19308c---70976647348.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/vigun.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/43b209c08ac1bb88f228c5268583c462/1551195553.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/fobodej.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/35059682991.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee79d9a09---sebajufagoje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65173e5e2---16455865295.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2663704d15---75565388418.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/96383470734.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/duwolarego.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93674119082.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/91374436289.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/dagaderumajumo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a719a102168---68401371332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=new+balance+md500v7PDF 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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 15588 bytes
SHA-256: 0a45e115fd13ba358b48baa0bcd1c7582bf4563a7b70a0949ee094da10020fc6
font_02_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10528 bytes
SHA-256: 767aecd85b237b2efa7dc444704058c67d9f6e3905bc33693f5a2a0f6ce72363

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