Malicious PDF — malware analysis report

Static analysis result for SHA-256 d237f1125feb6bf0…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 22:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 115639574a3315764f37a7e7ff68596c SHA-1: 788c69e3fb8724949aa7abbbb4681ee76d4bfff5 SHA-256: d237f1125feb6bf07799e21b665b84d1d23041fc37d960588a195cceefad9e21
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content or lead users to phishing pages. The presence of these links and the overall detection indicate a likely attempt to exploit users through a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9788ae1f0---13216830899.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/68574062578.pdfIn PDF document text
    • http://df-foundry.net/d/files/sazasozutevamarisonenokez.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984257682c3---dipexokimitowegupitesi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c3e4d29ca2f315d86a6ee9ef2e34f4f5/wonejulana.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/26860612537.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/3994b21p8q2cli9o47b8ubq3h2/26307704167.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/xokokifam.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba74d61f6---duwiviwibifodene.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/pulebavezakavifosagijad.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/866b2804c4b12279f475a085ffa00441/ruwezosezetipovuxatap.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/95681065069.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/38309751843.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6371925---dewedobi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ea87dde0---watumabopi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/niu7fmcjkthf7j7509nl6f4f8d/rosarugawuvege.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b556217---melegebusozevexigata.pdfIn PDF document text
    • https://medtek.vn/storage/file/devubekuzukox.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3f392eec37f82fdfcdfb6d3016a186d7/16361372185.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d5331f928c67ff60090556567a1521b2/56120828052.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7baf2351f3207559ffd5433b55bf16a8/69058198546.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/93ed88ed7e0512ed97baeb657be66c3e/24117032947.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ecfd1d0f4---61381759197.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2b692382d8a70b2d904356591dee63ba/jexonupajegizisokin.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/venafukava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+play+zombies+cold+war+freePDF 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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 17448 bytes
SHA-256: 1eeec49c242e4e8d411e2cf7d5e395a3e7b27b66ab2cf619b23f7c9445606215
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 11068 bytes
SHA-256: a7669d3637c4f93391729ee040e61fc1dcf0514a3f757dc99b06b84f4e3935bb
font_02_sfnt_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1