Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdff3ed856b85b4…

MALICIOUS

PDF

77.9 KB Created: 2021-07-04 20:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50d720a8b89c0c361be44ec1c72e0242 SHA-1: d1f47d378654d9ad3deb3550b29cc1f0bef23a97 SHA-256: 1bdff3ed856b85b495a9bc8a0a6bdf13aa66b6e9da28eaee327693fda929cfd4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering a secondary payload.

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://accuratesearch.com/userfiles/file/bofinasaxifelijisovato.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25ddd124c---2917286205.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b16c9c93---99433526162.pdf
    • http://coinproject.com/userfiles/image/file/refijiragobamodubawumefus.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/33p1sl8gba39114r9116pigh6r/86284498000.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/97842881846.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/zodunibi.pdf
    • http://santamariamikado.com/uploads/files/jimanageresiwemexari.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a258be9a---fexatonu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4acea1943---92613518455.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160776ff0461d7---pajulamir.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9435cb8ab---693488081.pdf
    • http://schs1968.com/clients/861610/File/13897161045.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609170b16bb4e---2223918312.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/96283923958.pdf
    • http://airconbank.com/upload/fckeditor/file/kasozenorebewegebomofuvu.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a021346a1b52bf6a5fb90838b1f1f7d6/55153560163.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdf924ee8---bodelinebokaxomized.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8796d14d47f576502d1d7fa936e0f514/dafovarewulinomeluxavup.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16ee127d6---58387857514.pdf
    • http://k1a.ru/images/files/file/3585318171.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081783d58839---bedelifajovokojuvar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+art+of+selling+pdf
    • 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_off0000d040.bin
30e1459baddb5c95e0be976c81096adcb12f4b574db83d5a2cc8f298dcd7f07c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 16336 bytes
font_01_sfnt_off0000fa38.bin
1f3828dd786f067dd782857342a55e1bb75b9ff20fbec339c29010541a0020be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10740 bytes
font_02_sfnt_off000112a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 16792 bytes