Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37b536bda085b9c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-22 16:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8e1e9b90daccf0392602e854373d138 SHA-1: 47a929dfdab8adf3f863316ede346a6d62d2aeaf SHA-256: c37b536bda085b9cfc87121c189162b4ef24e2b8011078944c7e8004578a924b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users, potentially to a second-stage payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608beb7942ac9---lumufefomusonedidorot.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/desixopaxerunefelas.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ipelari.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/45952279076.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736248b2911---samilapexixuvarurulifil.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/tepowenefalemibo.pdfIn PDF document text
    • https://etadelloro.it/images/file/53151778578.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/49524050726.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be32076767---89035196523.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4opqsin15sp3gd15ce9vid28b6/87475981745.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f71249a5---99708812859.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/kebivame.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/53808108778.pdfIn PDF document text
    • http://naucseto.cz/storage/31330436699.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608740320b7e1---rulusafi.pdfIn PDF document text
    • https://t2sc.me/userfiles/64657341161.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14989347951.pdfIn PDF document text
    • http://bwc.lt/i/92069956779.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/timazikek.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/87034417981.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/36735523232.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/3gbummqlahhp9bjt75uvrpfrs1/43231068889.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607877709b62b---80126197913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=most+powerful+chess+openingsPDF 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_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 10776 bytes
SHA-256: 8acd2f13f9a5d6c3221b56e6b355bc6b4709e258141653caf7733a9ffb77bde1
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16900 bytes
SHA-256: c30ccd0c03893a80016e48d1470111cd20ac304b976b8e2e98c79fb17663438d
font_02_sfnt_off000143b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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