Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26efc93c1cb403f…

MALICIOUS

PDF

89.8 KB Created: 2021-07-09 15:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03a235e35d1e8220f2eacfac562c5cc4 SHA-1: fa7110597be38f10bc0d658bf029d60775824a05 SHA-256: a26efc93c1cb403f53a62e6cbdd05c6bd92d7237d97ca2c9a953c7ea878d054f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://coretry.ru/uplcv?utm_term=recognizing+and+correcting+developing+malocclusions PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/768122d40b69b84bdda83a6d6c4b42e6/90921738638.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/78866835917.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/86f48ffe5dc5954772e03c5cd681e8df/vujawodilirupetifus.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vovotagalerededa.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83cf8a668e---biwivirogixilegajun.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeabdcaebc---nibosa.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/40203345771.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/89459340803.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a5345d44a---11253585412.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160912275a0716---88397857610.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7149a4fb02---11077515815.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qsrapsh7r8migok2r8qd3ohp5j/14865303095.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d20f4c2d0---83410626259.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072059729173---9063363843.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/79293745369.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zerosafenosag.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949ce8e9d86---11445282849.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085244b2e929---55092755302.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fa33d66d446190e0704c0eae6572c56e/doluvunolitelimodafipi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5ce91868---juderuzomajokijifipi.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zaganipuvubepupisil.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/38472303897.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05d194d4db---lixawumenovofulogunaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 11128 bytes
SHA-256: e029d026d1c5e3ca9fa750e4a5e3512805d88262a24c8b9e198a890f0f215a0b
font_01_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 17860 bytes
SHA-256: 6285371a9d3b02fb3f63bad50462cbdc40da09cad8cd3cde8d06df731e647cc3
font_03_sfnt_off00014da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA6 2640 bytes
SHA-256: a0dc47c6e1255173bb57341bf60a73926a0c4dcb65af146caadf97e424a12fb7

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