Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dda7512f3f670a2…

MALICIOUS

PDF

99.1 KB Created: 2021-07-30 19:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac087a884bf7c43bd6aa804d87696651 SHA-1: b52df8548d20b769d9f5a29c07ce8e1a08c7b6bf SHA-256: 0dda7512f3f670a29dafe79408205b18b28a527251fd1c65cee4380281ab4355
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites that host further PDF files. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious content or phish users through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160700d20e7d1e---24121559195.pdf In PDF document text
    • http://strap.sk/uploads/file/votis.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/949838820dec7ad4a9520675b2233fa2/vavidosipaw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d5f8d521b6dbf25263e4bf67c24accca/27796842084.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/kidukizuwemorat.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c94948550ad---vedizowisejusut.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/biranotorumapufa.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/5096826098.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a3f4835cd699752ff5e680a01ba2e9e7/1255825053.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e67c90817f9716429cd1da15a0e7537b/11561802752.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/69672731295.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/batijapogozexawoxodi.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/sekixeromarawumibotafize.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/74390139868.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/11dg1j28qnuf53lcefofg3ig3s/73184420174.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607216f955e42---kinaz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4180de725e---pixagur.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096918c86dd9---xitolodemerejijatut.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b960c1b4cb6---pigolazalumanufulusu.pdfIn PDF document text
    • http://abnicum.ru/files/file/8294527282.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f113309f28---16560325343.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/gujexunutikavudewenim.pdfIn PDF document text
    • http://novichiha.ru/pic/file/63651622918.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ba444f41f447b002c89e8dbbff30c4a/93560318899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ford+to+international+parts+interchangePDF 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_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 17624 bytes
SHA-256: a2e9d209158a69189fdf46b6405901cbee0e42525efd1314e4f70fef14eacf98
font_01_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 10768 bytes
SHA-256: 2606dc1eee30fe95f6827a0a7a0c7dd4abd73cae03da0025fda2c9e2e83208cc
font_02_sfnt_off00016666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1