Malicious PDF — malware analysis report

Static analysis result for SHA-256 387a9f2b01053a8f…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 05:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1deec593b97413cec41bcd96067c73c3 SHA-1: ddcf26d14b0964a053d108e859719c01c691b613 SHA-256: 387a9f2b01053a8f62a2c0ba6c23e2a8ff70b80281358b951e2678e8f4ef2edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking these links, potentially leading to a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://forglass.sk/userfiles/file/98841386308.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nofav.pdf
    • http://safarang.com/basefile/files/pokudepuka.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o8mq31d9rct517r06fa2s37cv/20687092969.pdf
    • https://rugsinc.in/UserFiles/files/nusilejatuvozew.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/luxutitemofalafaduxi.pdf
    • http://proxima-design.cz/files/file/7514306889.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rutizufek.pdf
    • http://sunnysolutions.it/uploads/assets/file/lubojerazi.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/aa5ed3b45727f8df6cc5c57fa5ef019c/zujesunaretesil.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sapufewupiv.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d26099d7---73719643733.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f5990c80b50---dowokosaxinokojive.pdf
    • http://verduciautodemolizioni.it/userfiles/file/39067139145.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gezopewosixofazaguj.pdf
    • http://fermobkorea.com/userfiles/file/20210807030430.pdf
    • https://masini-de-ambalat.ro/images/userfiles/76042783162.pdf
    • http://geniuschulatutor.com/userfiles/files/wubujimumutimusibenogo.pdf
    • https://stvorki.ru/files/file/ketuwuluvipolidu.pdf
    • http://tsg-edinstvo.ru/userfiles/file/baxadepijisotekuwegen.pdf
    • http://alliance-ltd.com/userfiles/pugaguve.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/3402285392.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a474fa51---61021495849.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2b8c6446---nipojalegot.pdf
    • https://starbox.fr/img/files/10700396490.pdf
    • http://giaexploring.it/userfiles/files/xegewazufekurizuwadusotul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=100+prize+bond+list+2020+lahore
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f6.bin
2bfddbdbf2393db07ace29e9faccf82e30b7d7f1b7fce1c3800d9ef2c9a1ffeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 10884 bytes
font_01_sfnt_off0000fdde.bin
f9b700a4a2c0b14fac7a588a61295712cbf9f530c97ed82c0db598f0e4243a1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 17132 bytes
font_02_sfnt_off00012960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 16792 bytes