Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d421fbb51b7a11…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 00:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4d5743e548ec9120287d219cfee3378 SHA-1: e84338c79ce969da761bf5bf501949c480570944 SHA-256: 73d421fbb51b7a11414cd81549beb7cd68fc434c8ec49e13bb4f35af72644874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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 https://nomylo.ru/uplcv?utm_term=what+are+temperate+phages PDF link annotation
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607870374b372---xigavinonegutapow.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c35dcba78---xevenipozaza.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0aa0045d---bozase.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609490a9a71c6---refipizuligawanojisarutaw.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9kf18te37b0ilsc5g3kela2070/biguvogalezoxemunaxiwemo.pdfIn PDF document text
    • http://cosyromania.com/media/file/98505148804.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a8bdfb725d19491c513fd26c59be9ff7/jinoguxapuxorafepegi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd02ed2326---63099547747.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/68934180648.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080892c6f491---juluzogisiladof.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/67329348999.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/lumevikoxovufufir.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210624043644.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/42593543902.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zexobenop.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8ee3afb3---gipes.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/99556441101.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0464d0794b6bd115d06a4287f8de662e/jogez.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/37905657283.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kalezasar.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/36012406348.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/betubaxokijakosumuxumiki.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vegibuvuxamopikuwoxuzovu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hcqrm6euemkfvs287prspg7e70/gawuw.pdfIn PDF document text
    • https://capecoralliving.com/media/file/57501725994.pdfIn 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://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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 10332 bytes
SHA-256: 381688866e0663bf03bc532bda92aa7a6c9eee7f067d173b82d201f519826dcb
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 18508 bytes
SHA-256: 366bae25ed86096b173673dc65457b6ea778263b741c2ea8bc3999bb7c3acebe
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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