Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adbd0a6859170c6…

MALICIOUS

PDF

74.8 KB Created: 2021-10-06 11:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8a67d4adfa946e72a6a8718a4aab051 SHA-1: 7fc7de7aae1e9eabba256aa038548e119beecf83 SHA-256: 9adbd0a6859170c6103cb82011cb34d106b61ffaf08b71019b1decfe9383a3da
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://detskypohar.cz/upload/file/judujefemidezelaxevowil.pdf In PDF document text
    • http://tiquital.com/documentos/file/worumasisupin.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/wunotovabejuden.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/pugoverotewovido.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cghkhm44d3t3anufn7tsaddkn0/87071895273.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/vikusave.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/wanexafipebudinebum.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/fikufowosamubisege.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/93105611595.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16149ba34d69c0---kopupitasafitizotatefufag.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/78660401674.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/muwutepulejebajoxu.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/gosejeju.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c77a64677---32953525447.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/zifixijufezilo.pdfIn PDF document text
    • https://bczenekar.hu/files/file/23302564802.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/ditolawafesilofekikuvopob.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/busetogisaki.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/93186920230.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/14277482448.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/74101272559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pale+blue+eyes+meaningPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/58377222775.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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 17660 bytes
SHA-256: e8d58b214da95571c5a49457c7630f23f366283af27045ab3c66a65ab2ffe1d7
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10488 bytes
SHA-256: 5ee3ede5b7ca99478e66d05c1c082cf48f33dcc08d85b8cea31fe478e3b3d3c3
font_02_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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