Malicious PDF — malware analysis report

Static analysis result for SHA-256 c423135d3f7d7b47…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 06:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 240eb3906ab810ff31875f33ce1f284d SHA-1: eb3956d15c272eb0c7dd58139bf51223364a5e77 SHA-256: c423135d3f7d7b47e32ecec7a82a8bfb5d067dac2b69bf3a9269222d26f09610
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aae81b37b156fda171f3b6bd4be79532/57203789546.pdf In PDF document text
    • https://cvsc.co/userfiles/file/banubonifolixipebino.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/67736814497.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/49129753151.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/fevoligejegilos.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e35d295ca---63487238280.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/92554553120.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/26009884905.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce344ab3fd---99870118129.pdfIn PDF document text
    • https://khanikango.in/file/28472303778.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/8770702193.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/28612643433.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/95gmggp7g5j9jsq0i6hmt6mje7/7755733220.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/20911000066.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/lurifoxitoterufijiremalix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c19d424e4---85498720102.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/93676384830.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/72388a7242fcddfe2ef17717018c20b8/liwogugubixosal.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/94945339740.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883bf8f322---84871918020.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/kakezala.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/24418447717.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/64700236573.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/860834065.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ac5ae0f435623000380339858ee028b/deromidowenenedulote.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/delojunefeketenosarurutum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=three+phase+wiring+diagram+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_off0000b719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB719 16124 bytes
SHA-256: b172958790884ee19748be58aa1f9ac67c994e31682b6f53289387c47e4c06e3
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10732 bytes
SHA-256: 2e61f53715b74dee970e385fd45e59266a9ef7a8ef58d65a03e9e6f85f8be684
font_02_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1