Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd8df06f59af5a9…

MALICIOUS

PDF

89.8 KB Created: 2021-06-19 08:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 87fe97a2a5840592d316902c47837e73 SHA-1: 7b207fa18898747ebbb1b4183da86363b5bdd026 SHA-256: 2bd8df06f59af5a905af8c90e412e5519d984ac319d38f1126352e6661b63704
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://freeski.hu/freeski/file/90705374311.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8bbe41a7593d6d6e16a4bed418d57cb5/mirirunodabuluxenibas.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pjce8aa5582daa2gql1eq9gvhe/fepixapewogaguzeje.pdfIn PDF document text
    • https://magerp.org/upload/files/dubunazigoxujok.pdfIn PDF document text
    • http://charivne.info/images/file/kojonaveveremaduzojitafo.pdfIn PDF document text
    • https://premium-house.uz/images/file/nejisutetowi.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/mopezimonutenefiliw.pdfIn PDF document text
    • http://bronia.org/userfiles/file/40179096537.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/sunetexugiselerinewaper.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/89083735290.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1af076c8---42648019971.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3a9d7aaf---faworobupojikotow.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9d67ea4c---mopikugapirabopek.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f78307b337331ba3cb6abc3f1c9f631a/bodojunasa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xidefekuvuzatejumaj.pdfIn PDF document text
    • https://artbynela.com/uploads/file/zakutewefeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=123movies+raya+and+the+last+dragon+onlinePDF 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://scripts.sil.org/OFLIn 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_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 5656 bytes
SHA-256: 6be9d52388f2085e6a78ce2f59a149f28e6012ad6e73b5cc91832068dc1cc72b
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 12012 bytes
SHA-256: c5bc1d57624270e6122b72d787186afd05c5f1ac63ee5407eb85ec1cdc39dd7c
font_02_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 16588 bytes
SHA-256: aebe08dbbc53b61d80ebcbca388491b892300e0cc7e054924418cfa480e5ee0c