Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0b32920f20e8a…

MALICIOUS

PDF

75.7 KB Created: 2021-08-05 23:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40df8b3c200d3930b923bf93d4dc9f19 SHA-1: a9f762856797451a666b1d0637aeab4874a464f8 SHA-256: b1c0b32920f20e8a6db4b2d8a7927523cbfa9cbbd56e6b40cc177057de963dee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://michellesmithscott.com/clients/36670/File/tirodadutinuwedoruxuzuji.pdf In PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/30527776225.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/02gphu7lac5k5ft3gkv5tuu3mh/76178291878.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/22232977408.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pubositakabiretul.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accec2e70be---xatelifof.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcdccc2aa---taregogukagasujalimuzen.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/99025341261.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6dbmddbtfb1s5ef2bq3u0qm1v6/1642656069.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/72045151305.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/redinanobefaripimejemus.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ac1aedd4---87612785994.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/58022efc2cb88d2a1bf24179a96c2551/panukeni.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/15381162525.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/609955eafc2f755ba6ec67c3d6ef8243/julomonukep.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855f2dfa0d---71159480048.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/wawejokuku.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a61c4a32a---80897606967.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/ronejonerofagexozaxinesu.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/ribekuxuxufi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a7906d52780f6abbb3390a103caec7be/malonalunobovemat.pdfIn PDF document text
    • http://dgjst.com/upfile/file/38117768997.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d5bed0cc---44432978867.pdfIn PDF document text
    • http://headrepublic.pl/images/files/favulebuxuwimetumowefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exercice+quantit%C3%A9+de+mati%C3%A8re+secondePDF 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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16700 bytes
SHA-256: efad870223c76fe17ac3dea8ac4253ee39916b1a9745648fb9ef8b699049682c
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 11124 bytes
SHA-256: 0aa99dc70b3201f8652b08212796f62bae699c0c1f071af5be059a75548a03e2