Malicious PDF — malware analysis report

Static analysis result for SHA-256 3198c8df86eb5b58…

MALICIOUS

PDF

74.3 KB Created: 2021-08-16 06:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7bb89688e5318d12acfd311b51ae2e23 SHA-1: ac38f5a1651dd0b1f3fbbe561e2d4bfabe8d3b06 SHA-256: 3198c8df86eb5b588722873466a93d5c54aa9e5f66a24bb5b8e531356fa63bd3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d3979abb10b---jononinurobupag.pdf In PDF document text
    • http://studioriggio.it/userfiles/files/wixalibenesapufeb.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/33447751185.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/petesoveda.pdfIn PDF document text
    • http://18554080.com/userfiles/file/larifa.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/porosemukapowegunejok.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bc436732e3d0c5a96360c1d4be54e515/27987728669.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f83b1e0462---4532950691.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/mazixup.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/lamakepinatizidetog.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/78694664688.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f813955ea---85608890859.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd837e983e---surevove.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/32077748088.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107231649428143.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f143fe85fa---3041268440.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/mokalugavasor.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117841fb80---43847677552.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/segudadori.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2dab6de3---gasufijimimarepegenunivab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=balancing+act+worksheet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF70 11132 bytes
SHA-256: 0ce387bd66555aa3f74b5a37dac5fc4dd9a0ef6481353ba90aff666422620c4a
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16404 bytes
SHA-256: 6fb2229989e677ed3027c69409e4264f44cebada26102731735a312dd3810ea8
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1