Malicious PDF — malware analysis report

Static analysis result for SHA-256 54adb33703c66f76…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 07:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 028940be0f8fae1609d8265bc543737a SHA-1: 85dca65161b51ffd3ab96494c9fd836e0ffcbc87 SHA-256: 54adb33703c66f76ddacefa204d4d9d3adb58f9657e7814fc7a63607cff3316d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary goal appears to be phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=indirect+and+direct+pronouns+french PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f2924478---litugokuxugutomosepu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb43333589---68768123762.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/40786dd8f47f47421d04bc9dd824f60d/xipumisofa.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/29d23ba5b0f0dde69cafdd06066706e0/lotopixerofam.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e40a29bd4---seguxikedafofuxisukibu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b9140482---gururoxetevegumoranezi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/80492473586.pdfIn PDF document text
    • http://rld-carbon.ru/file/damimeme.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/jitonupetetepubilavu.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0df2b7bf6---20093913352.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/47153271750.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d562317218---88373450943.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/5926689786.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/10712879696.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da224dae8b5---zuvovejetadawekuviginip.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/47718815457.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/64492383813.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/fibosepev.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4777d0bbdf63235439d4d707844573f6/xaturebejegajuv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610637d1a9d04---nubudoximovom.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/tidoxepimopinuwefelaxeraw.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/75150868087.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/vojew.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74511627821.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e7e1acbe---fojem.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/28775190715.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 19664 bytes
SHA-256: e3358d9a524118ca0fa7c8f4eeb44700627411d2ec0cb85532bfef963803fe02
font_01_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 10720 bytes
SHA-256: 9a1a2008bd77ad4b2f4df20197180caf929073e51b57f5b3e075a1f55ec2f959

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