Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a90416adbf2a0c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 331941f94cc16a48d9abaab0944cdf39 SHA-1: 260c126a8ebd752f31a88d01a2d296725d064c03 SHA-256: 45a90416adbf2a0c8d9aea7b17c64ee8866ef73f08780669d57f8e3edc5c7bc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which are hosted on compromised WordPress sites or disposable domains, 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 links and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tahi.hu/ckfinder/userfiles/files/263163479.pdf In PDF document text
    • http://studiosantomauro.it/userfiles/files/32743363865.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/rulumewi.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/37997226211.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/57585314635.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/94060023374.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fv6iiohjvjivrce41vkejlcr52/55382154184.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/89006187132.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/xugililirufokanen.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5e855f4---zuxezopivi.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vefubejajoxa.pdfIn PDF document text
    • http://zerosquareonline.com/file/89079337289.pdfIn PDF document text
    • https://brukspec.pl/upload/file/vegavedez.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/87257841052.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/pafetixevobonadazome.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/ponapalimozu.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/46690492682.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143e82f10a82---lonedafefifiremu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/abfd0eb33d7cad4e10961742aa852007/tosalomi.pdfIn PDF document text
    • https://italvaping.com/file/42501229573.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/nitaj.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/25786929736.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/gunipasosiref.pdfIn PDF document text
    • http://chapelguild.com/images/usr/82021277292.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/95233080969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=used+mobiles+price+in+pakistanPDF 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://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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 18664 bytes
SHA-256: 8f8734d898e74b306ff9d5670a8ab5e24a14e11b1631aa8bcf97909d18083d60
font_02_sfnt_off000130e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 10916 bytes
SHA-256: e326390dbc015fbfd058f492c5c7a21145bbdfda8ed7e0438dcb98cf08dc4603

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