Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7109c1d53fe516e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7a52818dadae7531e282a4cfc27e79a SHA-1: 5376a56722f813b0c557027901e5108b62f48114 SHA-256: e7109c1d53fe516ee2be0baf780bfe561ae27a5127d827bf6fcc3c8fa337586c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=knightfall+batman+pdf PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/10a686dc20f0166e4dd325aa5447ff0b/rogojelifazajo.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pelikati.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/25958050198.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/70677865629.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/50003487815.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/75498258652.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/bc58922cc8f3362fc544166d6b2bbaea/22300535435.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/65a9707566d4a223c9516088d55babb6/lavapegefapib.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdc52a973---86194047787.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ff24777a3d06e3256567fddc9415d7/88988369480.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/daxekeselufi.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gogijawonu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608531548caa0---12839031656.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/nulovukor.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/eef011f83130ba398be048147a39150f/serigomiferironujevomax.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fcig9k25g8tent720dsb19bc5l/36739608176.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xinosenilik.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16128d0f4775ec---duwopep.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9jrji6ng943imvrfh9anhtmr97/46182530058.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210710_110211.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/27679941848.pdfIn PDF document text
    • http://goldmustang.com/files/files/66452748200.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/busenotiruleporelubu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6d1c09f88d919a7fe6ddbd4385827d1f/86381163829.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/93845869160.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_off0000f330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 17004 bytes
SHA-256: b3db799d582b9242fa2f043582ff08ebbdda12ef05a4999aaa7427916727ad21
font_01_sfnt_off00011f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F30 10556 bytes
SHA-256: be60277f16e677a60042c176230b26b6b91fd443c9371136904b352683a92e56
font_02_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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