Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f606d2e06b3f48…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5b602d44b63c2da9c340ed5602e56da SHA-1: 49e534d6c56cbae76612c73b40101cd9eb9473cf SHA-256: 84f606d2e06b3f486b1ae2907f621b8fcf90ea3f5279f273765472fa10ac8926
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=nhmrc+guidelines+pdf PDF link annotation
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/worefowusap.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/12372082720.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d94e84ab8e3---63978748088.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba136742a8---36219531039.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a286c8ef0---73394215962.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210705223438153.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/71232350500.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/rejadepopev.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ikinvbis1dsk3k32m4bgvpesa/geluwogik.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/73963697643.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/83628624049.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160887aac19731---dubefakusodo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mavisoruzoremavemiveja.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/1229956499.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/98288862554.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0450206d---vazilarusunepabonigotaw.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076310aa47d7---kamapurides.pdfIn PDF document text
    • https://majubesar.com/contents//files/55024127081.pdfIn PDF document text
    • http://modern-pro.ru/files/file/mawoxakilekojetexixed.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/46712423141.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d53ff08708f---lalijovanekonenogom.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/50904602766.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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 10764 bytes
SHA-256: f4a0800bbf846f8bbb3b1619b44fa702c755dbce15fcfe5c5fc2959fd3a3d15d
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16620 bytes
SHA-256: 0a7bf0c3e6811fd9650ad895dd1b6dc47bcf4ff391eb0763ffc1ed24d6111ec5
font_02_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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