Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe0927120763638…

MALICIOUS

PDF

86.1 KB Created: 2021-08-11 00:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9f28b9dd53c4787bf324417f0e21b92 SHA-1: b9aa97b12237712553cf565f02b91ae2b9f48d74 SHA-256: cfe0927120763638bdcf36ae09fcbf202b71cf1629c4dfa20f8953e11bb88b9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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 https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a462f006f9f---32486507464.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/beravuwubaxopewip.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/jifiregasebajededupa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65315beca---50479390663.pdfIn PDF document text
    • https://marosme.ro/hirek/file/xoxujifajavokexav.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/41791500114.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210709041915029009yf7g9y.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/52eaaebb8994246b579508e4638df610/zofukokigevulukokar.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/35802656192.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/13684947074.pdfIn PDF document text
    • http://otczenacts.com/media/files/moxigepinafur.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2f81be3c6---wivobofebelukiwixavar.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/29829241928.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be18d1d3c7---36936606792.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/vilaluzirakurugogow.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160881ac72ff5a---tikazabomejiwanosenibuxut.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/2971114284.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5d0d0e4f---bukabovaw.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/21847561203.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/divekolog.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vudafaradamijomol.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/tobafavojukevot.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/952610882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+reset+my+hover+1PDF 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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 10512 bytes
SHA-256: 7fa685baa60136936c0f0a87c78872fa3e4236d63dfabd91d219d97313ecb602
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 17620 bytes
SHA-256: 612a1ac385847f8d0c97562fcfd49ea949eb5a60c9d6b43a8d2a2745d571277f

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