Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e2783919bb0e8d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66a0831a16bc2943dde883ce69ef45fb SHA-1: d9dc192448139165b303c4b16b6c0207ade71daa SHA-256: e4e2783919bb0e8dde9888541fb6c96a69a8a64f56aa2abc2597dd2fcc66dcbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chanakol.com/ckfinder/userfiles/files/zebuwogidimop.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e14a2e343a6fe1f9defeb23f2330e17a/81496963367.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/64105473331.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/17044399016.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/47530776653.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791be04c2ad---fitukunojifudaj.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/59869472350.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609137fee3723---9967031805.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/95215478445.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fe31f0e174e---92196737268.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/32490469255.pdfIn PDF document text
    • http://dejede.com/userfiles/file/94464748548.pdfIn PDF document text
    • http://parfumland.sk/upl/49474877930.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1c8293c210127f9b21193c0a0c938fa2/27579862958.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/19egp6apm9n58gusm0qt3lvoo7/fikajivivuwuwafopadenuxiw.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jijamuxalugixukojefomuve.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/zowudin.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2gb9mgv0npdokm5demk3nt9jc2/83441336055.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/jarubajatafezoguj.pdfIn PDF document text
    • http://clingac.com/d/files/86474482275.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/tuwikunorofaliroxag.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/20fk6dpuldqkrlp9golbpbmo83/gesogupowigiluxabelidejuf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/knuj1mo8d0sm3t4ocn28t5a00t/1537869658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+custom+cape+in+minecraft+bedrockPDF 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_off0000c2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16664 bytes
SHA-256: 5a04305a8b120e827cf6a0870935fe536132839e6ea6f857d4967fe163562174
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 11144 bytes
SHA-256: 98462b7629f841e9cd4feb7768c0fd13f893ebba4f44a5754d8a18f38ebe3221