Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df4acb8a7eddc4…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 23:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03511a583345caa39bd64e3a7e3872b6 SHA-1: 37a07236aae7ae2b8e1ef3f4113a4865f522a6f9 SHA-256: f4df4acb8a7eddc49684b8552e8d5630a80caf3ad829f5865baf227d2495c6c1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1b08ca88c4ffcebfeb6acc2c9b83e097/4235368998.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd80d547d1e---97775379029.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cbce481c7---fapatamovadudebijevibej.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/3insk78ks2dtgni47cb7g6qjq0/xusijimu.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/95aa3d88d0f5ccd3c647684a129876e7/kuwubugasimipabituxiwuri.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4dcccc3e---8937173095.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/baval.pdf
    • http://hongshengfish.com/uploadfiles/2021050808282364199.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa03692ab---93766446319.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5nv6blr3r028dcshdjgul6e19l/vawejavisepop.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e987463560---24186992698.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5a1e4a1fc---gufujakaburiwur.pdf
    • http://www.toptehnik.si/images/xamibugefumazulubomezapa.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/nazipomatix.pdf
    • http://mofrantech.com/userfiles/file/milisune.pdf
    • https://batikatravels.com/userfiles/file/kotaw.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f2d7aa40e947d15d608361ec20d4ca1f/mosedutejesexaluxijab.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607119805993b---xixatopajegidaf.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2424a08d8fe8a880fd17744eb9d9604d/wosipira.pdf
    • http://bright-mineral.com/uploadfile/file/2021062413552573.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608987833822c---mivelokolas.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/660cfd20a0a04ba8b8bb00ef4c02649d/68657196838.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/68175765989.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/01c5695e0019a8d20b4810068ac37acc/61222302168.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=2001+chrysler+lhs+owners+manual
    • 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_off0000fdf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 16792 bytes
font_01_sfnt_off00011607.bin
985791b12c2868b70f4c616943253f0583f94fc9a1aa907f0ee1d7b2440ac169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 17924 bytes
font_02_sfnt_off00014544.bin
77100bb55ee0f522fba3731baec9cf98a0bab9c95666b801de91be9b71265ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 10804 bytes

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