Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e48e237a067e7…

MALICIOUS

PDF

81.8 KB Created: 2021-07-24 22:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4458cd6c46f97bb73d52b2760acff3d1 SHA-1: c9ba07c32c40a0cd6ef9961a3945f4d73bee10f8 SHA-256: 153e48e237a067e71a2f74f26efc8ab912d4aeba9366ca9119b6032281e8b7e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huefpdf.org/upload/file/16795551343.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076623c9ad2c---19569965492.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab9baa146---kobeli.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/gabesaxarerotajako.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/69tko7ianarbh3lr6otjsph9f8/18128661695.pdfIn PDF document text
    • https://limsurempat.com/contents//files/67265242583.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/jebis.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/95619667678.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f67383d05fd---4998297859.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/27927915916.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae041a5d38f---gaxebizuta.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tinawemimexawa.pdfIn PDF document text
    • https://bnovum.hu/downloads/93572488128.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/suxuzupaliset.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/69085425472.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/48c1a83591df2aafef9ca5f280c42e1a/ruzegiximosiz.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/lejenoxane.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd7b2d923---66876928523.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/43745944476.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/3hl9t0fnkhturdfat78g0vm03h/2096361700.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/38224541616.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/gawuw.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/glab1fpq771pje3riili1g59up/balatusidoxenew.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/74340476975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=kasam+tere+pyaar+ki+full+episode+186PDF 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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16884 bytes
SHA-256: 0e670226c57f5d5dd761b45f1a7039d0359e0615d199a7907001c866361d558b
font_01_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 11280 bytes
SHA-256: 90c47f3bfba5ca192039643f18c1a8309f257745638298f23a39a0f72f130ae2