Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d376d554ab671…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 19:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68548a4ff3a8d1576854ffa850a10883 SHA-1: 3faf80f4b1fb73c18a45403a3d67cf0082d88761 SHA-256: 5f0d376d554ab6719ede317555d149e71e0add847fac6ef92f1ae9bdb3e77e99
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing vulnerable plugins for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to leverage search engine optimization for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/565d36aca2e7bf9b5fe9de99764c1a8d/79210775213.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085442368fa7---xefilufusafisiw.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/q8fu3ip47te2al6f9vr7e4il21/rivulelila.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5caad1fa7---dogakutitepufa.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/70892084772.pdf
    • https://diaochue.vn/userfiles/file/jatomi.pdf
    • http://0-50.ru/userfiles/file/2011443239.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7ffe9811---48006857370.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf007777c---58512634579.pdf
    • https://alihuata.com/userfiles/file/paziwe.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5efsc92c6gd8kvmrpkhunjg5q1/12009989221.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/f7cbd25dfeee692789f2d0c6894a8717/nezan.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279d899f5---rabiduvubilu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c294416768d---32490938985.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ca6f317e8559a945da099f45bd972cb0/redopupovurizemo.pdf
    • http://churchtextile.com/userfiles/file/98942366326.pdf
    • http://bjallstar.com/upload/file/50880162984.pdf
    • http://akssert.com/userfiles/files/dafedejamelubulelepok.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/61c61d4b8d031ff2fd732f23a10499a7/97822100626.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e57bfa9efd---71187169798.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9699df85---punof.pdf
    • https://oklasik.com/ckfinder/userfiles/files/84613742828.pdf
    • https://pbchistoryonline.org/uploads/file/peratakarerusirerisu.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/zinusafukezelusiwiteg.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a93348a163d036d42ca26658e63795d3/56434118063.pdf
    • http://turagent007.ru/userfiles/file/jumadukokivetivepexi.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/23327155616.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=convert+pdf+to+html+code+free+online
    • 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_off0000cc8d.bin
bc3c779231cd9b770fb7a5319495c928db40c2ecb46055f236c46f199fc0f968
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 33556 bytes
font_01_sfnt_off00011856.bin
21278a13e6200b57472718c697f0b187479fc5821ce08baaf9fa08ac192319e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 10652 bytes
font_02_sfnt_off00013082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13082 16792 bytes