Malicious PDF — malware analysis report

Static analysis result for SHA-256 875b519d665c54bd…

MALICIOUS

PDF

100.3 KB Created: 2021-06-29 07:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d778596086393b3930afab69aa8cb1c8 SHA-1: 6ed728f96b95f35d8c95f0cfc135cec01b167223 SHA-256: 875b519d665c54bd777d35409789c9ca2d8c26021fd58f2fa8b57240fb37af0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://mojahotels.com/ckfinder/userfiles/files/xovesil.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955610d9094---41777022515.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfa7d73d---5980927844.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f154f5600a66a9a44b4810c8388f3bca/padowuseso.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d9is9l8pescvff9jthstrvuhj3/81869952715.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/15387601709a6ae9cf98399af077bc7f/wujutawufim.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8d15c263---95280647477.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2dbab8dc4---94691253685.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/136429308ff068a3d99cec3924dd6037/18741274534.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/sizanagozavonowezev.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7cf2c9fe---zidawafugelegaxiputone.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ud1e124c2nmrll6aajrsk0s93f/dovidakonojilavol.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d2d8c8ebf1af99733c6ea723ce2b4260/54256848882.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/93102038073.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e04718e9e---xivorowe.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s8uofs6lugqqja1tv891udopua/41726113610.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/fozakamedepijulota.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6f67d3e6---dalizupojulop.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d3e7e80f96f92e29c36d398c4e9b5dd5/venugogaxe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb383a2d5a---15236016146.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9a462ee82b6febf8b72cbefbff9e11f0/42847972755.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/xinotamuzutulex.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c2da09e12---pakutosizanefofon.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/nuxovubipipenomegikaxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=crystallize+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000139d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139D7 19812 bytes
SHA-256: d5fb2c18c10217985f1bf38a0a091af5c2af18e13520b58fa87474ee45bacfcd
font_00_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 22788 bytes
SHA-256: 5656812ac28e0bb8fe2126a4ab6dc542a073c3487323d8aa6f51ceee76c6e9a8
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10640 bytes
SHA-256: 1c35d15b94763db343c328c804d2114b4ed14016ab518e2f57a28f217b10067e
font_03_sfnt_off00015b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B70 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off000168ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1