Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f15ef0a3ca3425…

MALICIOUS

PDF

84.5 KB Created: 2021-07-15 10:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe8644e21dd0163c40b056482e91933 SHA-1: 3aa6cd95132ef0285c92e7c3b692134a4d11c14a SHA-256: f1f15ef0a3ca342585fdc664b39646e5d268417a01a4a489b1473ba9f1e7da2b
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dobrasekacka.cz/userfiles/file/85195308821.pdf
    • http://budohurtsa.pl/userfiles/file/66496769240.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f5f8d196---rugiwolekozenu.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a80360723fe---68878885201.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3f693a90b79d1d57f33179daa7a0551c/88056498899.pdf
    • http://gawhs80.com/clients/873705/File/93637254972.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3514f3206---vonujaz.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d277354f23dcecb13dc6fcaf1be942a8/636249499.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2d71889c---11876169401.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f4e8b56e---zutisopu.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/1d2fc94a56881d862811f4dda450eb6d/21050480574.pdf
    • http://websurin.net/UserFiles/File/78153878720.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea1255f58---pukolugibabizo.pdf
    • http://cartonwrappingmachine.com/userfiles/file/xazawotojowitir.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b66919ee---73107078381.pdf
    • https://medtek.vn/storage/file/xudemoxuf.pdf
    • http://rajskiewakacje.pl/userfiles/file/88276878907.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/da44c251cb7a25962e60fdea14f0ad48/batobonupoviwigesate.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/ridiralekexi.pdf
    • http://dedanskecasinoer.dk/userfiles/file/75727071910.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a7b6314b0deabd5e3265266708ebc466/sosuvokozowuva.pdf
    • https://filetorme.com/upload/files/61611595209.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=after+effects+crack+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e772.bin
c39ca963de3f454e169d71eedcf37f0e168bed96a48b6f959dac985b6d520d40
pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 10420 bytes
font_01_sfnt_off0000ff48.bin
2abb5f135cbdee733cfb0a721c7bb072b3e636cddf4a626faa2336fb1743ba09
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 17448 bytes
font_02_sfnt_off00012cc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes