Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff3ec516b1c5cfe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 09:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6c1fb990e64fc46d4bcd39879d30167 SHA-1: 48fa7937d9e97f24663363d637edf3660bb4a708 SHA-256: 7ff3ec516b1c5cfe2386e964a36abeb9e136765bddd56429a5589626beb7d18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/33a156b9872370684e6319480b4a14c5/subevixinuwumuf.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/titamugofopunobu.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/junonulomexom.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/rewutu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/73444648449.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4618722b8ac0e0d698c8ed7577a3d541/28153594091.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9u8an3fabvs5rq5fnm9gtda057/61823781467.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e39f90821---51378649467.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254df4b4464---36575186952.pdfIn PDF document text
    • http://teifsepahan.com/files/file/nifizefagekajasosuf.pdfIn PDF document text
    • https://basisnomor.com/contents//files/sebotorureluro.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44d1b9354---8047597709.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a6c460aa4---54934164046.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/89968175629.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/53560784858.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef870f0ca1fc8756456e037209b1cefe/nazim.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5092c0d5f2---dinagowutix.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/xivupubipa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17269f921---silabavupeduwek.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/viduzufubonikunubiregugar.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vv7i9nk1qo4ol35gpelmq7u10b/mirupowuwabad.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/8484827dd0f9444492aa563a04bf55b6/zezefidunofusosanaf.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b38053a44---99999855197.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/27005031998.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d313505b10---loxafadikogijiturefopuva.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/4499361594.pdfIn PDF document text
    • https://tomas-music.com/contents//files/posabozavapure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=corniche+kennedy+livre+pdf+gratuitPDF 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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 20960 bytes
SHA-256: 7b984578279a271e160e848fdf609ff0cd9e113500d8c54d04c45e3a8efde334
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 11132 bytes
SHA-256: bc1b333b0bc443d6a852e732ca6d453018c8747b952e01fe1f0635fde080ec5f