Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c1f2b5fa7e010a…

MALICIOUS

PDF

85.3 KB Created: 2021-07-09 13:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3aba4cac9fa8d255dc7c1abb0501910 SHA-1: 0f1494baafdc47369e8e710e3ccb24975640e3f8 SHA-256: b3c1f2b5fa7e010a21784ae9c1c3df5027c69db9ea68a79982183a0823632e04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, suggesting it is part of a phishing or malware distribution campaign. The presence of embedded URLs and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=voltage+gated+channels+definition
    • http://hurtmar.pl/Upload/file/zazifusunabipe.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160965db4f0472---tafeledoripasizefato.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838022a0e92---xepolipa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5301a5db4a---55762363951.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeadbec59e1---80367753477.pdf
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/91386444939.pdf
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/sixamejigogomedoj.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/27821213496.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/43e010fd2d29bd03a55ebe2481f36eae/molulizuxetogupugugo.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ca136d6f5f35d678a67aa1bfa643926/jinisako.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c005ec789---12490115238.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jdp3i0q9d50fnk0f94b85itdq7/gejusevisidare.pdf
    • http://otvorene-srdce.sk/userfiles/file/legudepepu.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17c9a0b08---bisovudaxuxi.pdf
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/nimiwavetizu.pdf
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/lepaxidol.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhg4n9pluef0umpaksaqmsu45i/nedorotimotuvos.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mupudomuvatixowexujuzuji.pdf
    • http://gesundezellen.de/neu/userfiles/file/jixisimobuvazoligede.pdf
    • http://amadpich.com/userfiles/file/pigufudasexutijotekere.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee84cc825---8414049985.pdf
    • http://sosnovgeo.ru/userfiles/file/zenuzowotinezofe.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/60172178315.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b445b21ef59---zigiwigobekaresu.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_off0000ec0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 16792 bytes
font_01_sfnt_off00010420.bin
d92b572dae259f5efbae4f2f112ab85ef8f0f53f3d31b41615392555ea663d5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16788 bytes
font_02_sfnt_off0001300c.bin
3ecc3c6e8aef4c34bc71e746dd6d6ba4d105448050f9390a7b6344bf3e1f0bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 10624 bytes