Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2c2e3f1c254373…

MALICIOUS

PDF

79.3 KB Created: 2021-07-04 23:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c38ec60bfc2c16d9858f6a58c1397a7 SHA-1: 8b26f75808da576268b272d22ae8f7c01eccc401 SHA-256: ee2c2e3f1c254373306bf411596ada1ed451a285b4a6387d70ae0a3097d50210
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a pattern of hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct clues, but the heuristic firings and URL analysis are sufficient.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c844a725a1c035711c4baf38e3067cb2/79695947465.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/91a838a881fa962b6b383b8e20c67085/vuvupasazukagub.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/egn7703isismle7v9sm08q9eg1/nedusitife.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607297b5060ec---40459232291.pdf
    • http://carrasvilla.es/uploads/files/misosuvezetoduneluz.pdf
    • http://allamericannursing.com/userfiles/file/96275552831.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6fe5576fc31f0f31d3583d226829116f/bijesi.pdf
    • https://ckd-otto.com/contents//files/45815442987.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb8a4573a---xigukazikupepo.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f719406452---mopopopubome.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/deomn05hrb53991kqcrpt6bdv4/30093805851.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a7b2b762ebe32a64c6efc9059461de89/12512094973.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dbc8a53093e5ec1d152a3683bcb6fad/16904397891.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9854f07563db2c01b88e27c7612e27df/vibexekawelowijapupesi.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1d05bb387db184f35f89031159cabd10/jolagas.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b445cc7e---mokegesumifa.pdf
    • https://maisonforville.be/documents/file/solidokomeri.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502211836782164.pdf
    • http://asiavent.com/UserFiles/file///63561870742.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1dfbdfcd8---54926157009.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c54e79a708---safokeriga.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hdjrh98n5ouf8r0h33debal301/josavomagive.pdf
    • https://advertisementnepal.com/ckfinder/userfiles/files/53834896987.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9802f050f5---sudinizuzoxugida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=docx+to+pdf+online+free+conversion
    • 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_off0000d431.bin
2d7ffd9b286217b57fb009d48e7aee3ac6a8ed05534bacac61853b229c7afa62
pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 17000 bytes
font_01_sfnt_off0001001f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
font_02_sfnt_off00011836.bin
2a43fd4269b3bcd1bd3f0d7b22344f679fdfa63211e81f4b03a47619398d8abf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10620 bytes