Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dc5ead3767cd01…

MALICIOUS

PDF

78.7 KB Created: 2021-08-31 12:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9091ad5866834cd9ca6a9551376cbf70 SHA-1: 7aae7260e36a431023270e14626d2b6367a5163c SHA-256: 19dc5ead3767cd013b7c0f4b441d2d6834132d05851ed9fd6ac7152ed67f5a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. While no executable scripts were extracted, the embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec7c49cd9---widulajusojogoluluxut.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/69289806ba13180c4b569b15c78ef857/27291531368.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/15e049eb423c4b5deeb3547349ace02a/38428178944.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac6ce3c736---ludumokometezuparejute.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/87069873837.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e626c49b5bf---xibovoberarez.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf53e95ab4---52391103987.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/98l8opftu47u4dj9t3gtcnq043/wifafekevebu.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/74070274831.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/31858d87ab974198ea0b52803e0665c9/497189577.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b79e4f5a8b457b3836f68027e1a9b07c/womebavariwekifulijisifux.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/82934223441.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160babf052a7a2---68401703635.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/nejapuzoxaretu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///83509163586.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9c11238b---60003724737.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/69180419041.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2770539626abd1d8c9c2a3387ba79c31/sereduvajakapojaxux.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b0a4d54f93d9fbf4aac11bb9590a7206/97094995349.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/telorofiru.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073205956d13---niwomu.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/45801388653.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/53113205549.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/61642296878.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/56471300419.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba73e7558---faril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=why+do+we+need+to+know+the+various+contemporary+art+forms+from+different+regionsPDF 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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 16764 bytes
SHA-256: e79473504169408e0c4b983d82e20f5b453901870bce4668179c00139d33d3cd
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11472 bytes
SHA-256: d9387ced548db6e9a82ffb61b24fde5ac9c318ae5db45c8ab1c2efd02a59b2c4
font_02_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1