Malicious PDF — malware analysis report

Static analysis result for SHA-256 e803c8158dc73933…

MALICIOUS

PDF

164.1 KB Created: 2021-06-09 06:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d9c23d0bb8c3cd773fa28fad64719c87 SHA-1: 170c76a5ee738d9747c9fb88c286505fd51adc7c SHA-256: e803c8158dc7393319f3d68b58396cd6fad531b4190889e86b79a81185081b80
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 a phishing or redirection scheme. The presence of 'utm_term=minecraft+grief+client' in one URL indicates a lure to attract users interested in gaming-related content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to further malicious content or downloads.

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 https://garglob.ru/uplcv?utm_term=minecraft+grief+client PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094726ce1e45---30298176611.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9b1785ffb84aebc1564bd2a1fc258299/pejudasokodiwiwukepesiwa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947fcaea133---66162311997.pdfIn PDF document text
    • http://bjallstar.com/upload/file/2891438676.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097900da77ac---rojufofasip.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285f6a647e---vumuvudogajo.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/foleve.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f00a035b---fipigubikudekeburama.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf8a2a21b5---lomewakajijiv.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/medimogeduxikexoxatika.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a113780b88---budivukemibusuzar.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7e4045399a6afc34e02d55f9045ce8aa/81915559571.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8a4db4e19f74bf82bcb59608b02e0221/limewitegumizaruzu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d4ab31f5---83492124799.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d95ce9bbd85711d0260b903bed631d16/vodawunizobolutususe.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8f4655f3c2380a8dd11c2486e1aae59a/57734598859.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u60lcf5gt8199o3lr0nq8rokc3/nawaxafefogopezatik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002221a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2221A 10912 bytes
SHA-256: a387e76a9e23f8cf08699a6f9d868de11692c67b9009067e46fca3e11a7e2dab
font_01_sfnt_off00024661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24661 4876 bytes
SHA-256: 89b0f58e1cc3cd29cd2ae0aaa771b586e5b61b4df934c67109adfb3f0de3b97b
font_02_sfnt_off00025719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25719 13724 bytes
SHA-256: ade1261abf11065608082eaad6cf54629b364817419e3ed332a929d6864d4917

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