Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3caef990c014427…

MALICIOUS

PDF

79.2 KB Created: 2021-08-30 00:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 883cd358c940909b44f1063c235d7905 SHA-1: 060fa50369778eb7140cf8c9d41c53cce6db0ecc SHA-256: c3caef990c014427bb09d4f1aeab15622e34dc34fd8bdf2996b0d70df2a0b832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://etcad.net/np/upfile/file/suridodijoted.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf2aee0457---gusubapafinunasujewujaxol.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/42161088879.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kolaxa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be5970a1de9---betosemuwisuzakixiresif.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/35927187757.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/54176551736.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8020ac1419---59561567901.pdfIn PDF document text
    • https://iword.de/userfiles/file/25682416536.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/97659790b5f2d1b2a7ebe5a2be9bb1e0/46911886079.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/93637254972.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gofotoboweb.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf47a3297---sigiwiwegasetexesafi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/ponepito.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/tubujuzetuxogasixuraf.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/b0hbi6am6p5i6ij6hts37chdst/galifum.pdfIn PDF document text
    • http://52963566.com/upload/file/202108062121076718.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tejuta.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wiwul.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/lusalojofax.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/wudaped.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/38699658130.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/86120293634.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/18525909639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bless+the+lord+oh+my+soul+keyboard+chordsPDF 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_off0000d142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD142 17204 bytes
SHA-256: 005043855552a3ec9b603ef359fd465306fb71bbaf859ca50fcc5dcb6392ff6b
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10940 bytes
SHA-256: 96915afa36b6dbf39de863ec341a9c249595eedd3802061522a417b94edc4948
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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