Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cb169cfcd8ce84…

MALICIOUS

PDF

94.4 KB Created: 2021-06-26 19:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 919af5eff77e3ae8d9926acb7ed98a79 SHA-1: acb1666d59aaac251b9d97fdb7e936349b1cb467 SHA-256: e8cb169cfcd8ce84cc12cc46afc4aeb0b010f8bdbdfbf2aedfcfa9251a2a611b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/j3k3o12c1ehu1cv4jnl8mnlem9/46823253398.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/72jdb5g3a8ut3qnst281qvs9rt/lujufajisoginovaloziviko.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/90028531662.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/xirujudetuwepisubisitawad.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nikegufoki.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed8f6f4e8---virepodegodozexu.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/niwivezilukapijunapezat.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/57486329951.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mokogo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/12601864176.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04e01baec---2116437092.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7e03cd630374f73fbba6671f02f63560/99260126580.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/monevodutipefifigolarevu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88145cb9---wotenefak.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3758936e---66579904062.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085239066e2d---18012192664.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/424d00e514cbe3879c469732e5ae0066/97021218179.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/90478848281.pdfIn PDF document text
    • http://digifast.cz/userfiles/91682150540.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/80410028321.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/57eui07ns8mbt3uu9e1j9vc4s8/65873034679.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2e907e12015f905c1a81bd8a564e31b8/15387002039.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1d6c8f6e---xegubowewavosaxavadazu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795b332ed91---kematubidugirim.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/fileguwekupisilojoporosuj.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/hdqpihilspp4suqqlpkncg78oo/22956558340.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/72349806606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=child+support+nh+loginPDF 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_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 17544 bytes
SHA-256: a4c0232b9a0fc9c62aa26b18529f6bc8a5e2dfe32f019893a7323b0a742daa60
font_02_sfnt_off0001548d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548D 10508 bytes
SHA-256: 36da00e4313475d6568dde719035967e44f16ad47fb4698b834880cc6cfcea36