Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4215a2493d62e6…

MALICIOUS

PDF

94.3 KB Created: 2021-07-16 23:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f05e0b238d31a5bdcee4fde49c97d41e SHA-1: 211e881bd8cf31f710eef03e446ed80392b277a2 SHA-256: fd4215a2493d62e6145161b90df87bd0970fef47aa7a04643871e12a944d7078
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ouril83ri7g1960ff454m4uoab/belose.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2651826c33af448359cbe7d1d8fc4aa7/gafirek.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bfa9eab6e1f5d9e5c8fe5dce5c741201/gimadeboji.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160818cf1394d3---mirozojitapeke.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273bbd4e5---wunekasakisatonexapajazel.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/20192229672.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ba78ee3b12fb0d0876343755aa7fd05/57968237882.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/mibasukewejaxa.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ffd05979eedfcd009bb65e90f3e70d5b/44341163270.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/momusipumetasobasiw.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718290ead28---pefolekoxolaf.pdfIn PDF document text
    • http://ahchala.com/img/file/dativokedaxotepujuj.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/55252005305.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160887b9d92648---61687266978.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8f7c2d808b7d0584ff1eced2fa41c886/53711402624.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/9b80eae016871d4f693b6e635f2f6339/gosuwudilimedabisebajop.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160799b54d6ad5---23485514073.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/37171786574.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/mabosopuzez.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pitexepaniwuxeparosem.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b582f51162c---64233184121.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/7120303161.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7450644fe---daradobitomizeximusanadak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sample+recommendation+letter+for+laboratory+technicianPDF 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_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 11044 bytes
SHA-256: 092668f5eea7a627ebf15cdf4a5210828e95f5f74fdc538bb17ac35159e08c93
font_01_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 16708 bytes
SHA-256: 788ec075ef22902164f03938980da6af481be3c8846cfa9fd4e66c624ff90d30
font_02_sfnt_off0001538b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1