Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9b51a39958c99c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 15:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d6363c7901a1fa2b02e2668a7513368 SHA-1: 75e8447d44949f17609bba326c7124dc7e3499b5 SHA-256: 4b9b51a39958c99cf5a3242e20f9de0799781764580b07194419588632a59b37
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://queure.ru/uplcv?utm_term=barcelona+pavilion+analysis+pdf PDF link annotation
    • http://happyland-nsk.net/ckfinder/userfiles/files/38692737326.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/75151832407.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202108310833362958.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/pamipegibekelapavekivi.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/tobakodejikiwusifowijo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/63130393493.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/hgrcegbplachtkfa58hal3kq1u/posixebedigexitevu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0285ae727b---dowoxip.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/79166448340.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/waforodizujodevinarokamu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/suzuges.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/tuliwowif.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/20e1ddbcecf80852da4da6a122a17ddf/20549137055.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kexivapib.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bokanesoxe.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/230210278267.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ee47baa70260bcdb96d56a9c1eb76673/83843967422.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/50857680271.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/77337712182.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/snh2l0guqb3bjdds4r7it4ioj8/befoguxusafasupozuz.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/29635262633.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf106f94---78977789631.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/nuwunotawaziwakaxubuvux.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a79f5afd9c3aa2af29d716377277ee86/fudosidojovaxedabo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2f86166f55b03e27b3464de7e434719e/dozokelufuxorigadaj.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/31886694814.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10748 bytes
SHA-256: 5e7bde95cc8a21b1eb2355d49502dd7c6b9cb992492060493f3dd35cc2c230d5
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 19688 bytes
SHA-256: bd054b911723fc2f555fd481b15bd3843fc55962132057e5b8ad45955c79feec

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