Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b0482c8a3a5750…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a714eba146bd26e481138e43d5ea9e2 SHA-1: 29b0ec6b849f7e5e13a30692425cc69b0ad5c7b6 SHA-256: 38b0482c8a3a57502353c0128353eb13247ca242b78613c41c0e678ef5f14d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ecohort.com/userfiles/files/43011181324.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_2850A1C7CF8B7BD4.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/7597860965.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9722eab2288a15c1c8071f1e844f06a2/rugifuxeneluwopixaj.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bopisewarazipitilek.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/51078865132.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/nozesumob.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xukuxesubu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/dofajojar.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/59506599776.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21090509321095425078xbx.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/53260352740.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/sifovajisibujiwik.pdfIn PDF document text
    • https://ksboutlet.com/file/files/36996844748.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/14780468582.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62d37cded---85791904028.pdfIn PDF document text
    • https://negaratoto.com/contents/files/kizan.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40640822762.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zibazazakakezidozet.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a44e91fbb---titaxufonatanatomigo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abd4e9acd---36235539169.pdfIn PDF document text
    • http://dejede.com/userfiles/file/45746496746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photo+resizer+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797fec5afd---duxojug.pdfIn PDF document text
    • 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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 10360 bytes
SHA-256: 8e727cd221bd1abc8bced5faf0662bcccac2215863ce8856da333a080c60e057
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 17224 bytes
SHA-256: 88530ab8dc77066ef13de05b43aaff8c4638c6ed70b242df72e4dae3f22266ed
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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