Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dfa258e1a15741…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 03:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e9dcb00f1d910f223c961b659b4ffe5 SHA-1: 8c5ee02947cd8e451103b3d465e0cf2ee13a463d SHA-256: 80dfa258e1a15741c5e49a68ae54f648ba5e038b110e46be4be0b09697383d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF identified by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/26edf9146b7b49a154369bd77012c87f/28896644375.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13d575dd8---muligujilax.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fho6iehii44e67inb1np7ltg73/41504283539.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/98841892202.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf1ab3beb---siwekojomu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c72f392f6---44443990822.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/11024099100.pdfIn PDF document text
    • http://elanaclub.ru/userfiles/file/94109453883.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/sapolifiseridotiba.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/73349041493.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/88111291188.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc819b16e7---97994405284.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1k20v7bo78dseerd37mpkpcn1l/28622688480.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/16928130939.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/94480246149.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/kapofobiwamegela.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/timapuwozabi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115a3d7167ec---sibapajizufekepezu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d94113173---8468535497.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/lifojusi.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/24529691245.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/7154198598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=real+fourier+seriesPDF 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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 10152 bytes
SHA-256: 9bc7e92e4f470c461ffa9c328419cf6e6578dbd959c9d5eca852f1ea2a0e780a
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 20012 bytes
SHA-256: c9b0ed3609a5cc0fbaca28f9e8526627540d40287852c91543ca064e3345ce60
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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