Malicious PDF — malware analysis report

Static analysis result for SHA-256 538bf69f03174b81…

MALICIOUS

PDF

67.9 KB Created: 2021-05-06 15:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0007ef4bd69128030ef9154a4ade4f5 SHA-1: 7a17c6e9ba2c937385d05e1d023836d972411cc7 SHA-256: 538bf69f03174b81ed81abb1e08726c97cc03adcc44bc395cd1ef149df421923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=imovie+trailer+templates
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592b474f33---50751811663.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca3adf267---69406416617.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c285fe3681---39728305833.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1f8dbf94---80496030154.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/4f861js3cetj6g5nidcimivbnt/leduwukub.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/qovlc3vdol372t31q0fs32h9mc/77975042192.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa56ebba5---bikaf.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vu1k4ljath10fblv1ct0hc5nk2/wijojewitememivis.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160888e5d1f6ac---dewofesewabidexaxoned.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608837c238c4a---65201603416.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdd669168---9878076718.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/iin6jiicvm6tl2te7h697afah5/51906732141.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0181688b8---rurujabixob.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d5ab480f645042aadc0ba8733c9d1a16/banuruxisupesuvufer.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/43d4f1b1d894cb9a0647e530c3bc7e5b/zuzobipulisuzuz.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9401d11d0eaf70ee39758cd0562d6f28/folabitasufagubopiduxuve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d12d.bin
17cabb165e7d67fd2aa01884b86b3372512a4000544b8284c584333d22adab0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 4960 bytes
font_01_sfnt_off0000e1f4.bin
1e8d6185f9e811d547ca61cefa94e5b75ffd36aa5af4519698d078c6e7248e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10068 bytes

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