Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96dccf27eacbe78…

MALICIOUS

PDF

77.7 KB Created: 2021-08-28 02:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f60c79effc14a5e70a58e0c5fd7de61 SHA-1: 72f559584fcb9a142e5392ab928b871a77e827eb SHA-256: c96dccf27eacbe7890d9bc944882a6b879f19c8b460a1f68396b61a251236eb5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gmicropilotes.com/uploads/files/xigabit.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098e059aa992---32245169249.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/tufamokexiduraf.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/78267995559.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26c1a2907---9006491338.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/24964323609.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vadunigas.pdfIn PDF document text
    • http://onlinevay.com/upload/files/balide.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jigivujalolajesename.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/towusakunifupev.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/77592678043.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/gekogila.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/midutagesobuwuru.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/12826126264.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/dawejupifozipe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0de898f61.pdfIn PDF document text
    • http://cartopack.com/Images/file/fewaj.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/kusapojuvivovemevije.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e820b518854---83836958697.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/54789099976.pdfIn PDF document text
    • http://acelybio.com/upload/files/25095120170.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4b3b47c5---moxesoxumi.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/80600387926.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4d6e2571bbf15c819a5f057f3fbe3761/45862683568.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162321882969.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/ratagomamokorepefotodowuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lehigh+county+assessment+recordsPDF 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_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 10944 bytes
SHA-256: 3dc44d8abfe827d5ee92ccd9067c362d39e5737fdbd728e37e906313f4e7c04b
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16916 bytes
SHA-256: 34aaf45e0ac0ba63ba0d36b69d8c9be82cd49877be7a9b3d3efb0fa0e7ed2ed1
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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