Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fac3473931b49f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 00:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffa946909ba619dfb225c5f50f717755 SHA-1: c74c119b89a4f168171b2299438fc5d6452ef334 SHA-256: f3fac3473931b49fab572a29b4e9aeb9d9d45eac5f096e39f58aa3e84c35c0a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple compromised websites, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inncredel.com/uploads/74822262896.pdf In PDF document text
    • https://temahr.hr/files/85651495537.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2217b9adee79c6c825d6943b84db7173/barip.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160761f09dc674---dujowirexu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/govikadujajajoluwim.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/68371534329.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/14048185579.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/e83df52ea85cfc78468dec370ff3a462/lidupudigo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/80855892210.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/4067754f98c867929cc289a67ac1c480/90497834253.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/82707018512.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/39916413273.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/unhv2a44j64md86aognrd753ra/26038207017.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/21411554730.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c535aa334---81351390233.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/68675535503.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/xidovorosapuruxudaxomofo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/88408670418.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/34730058260.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bapizebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+about+being+alone+but+strongPDF 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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10580 bytes
SHA-256: 31fada47e0426d201eecd4a4e0501a8c51750c0d27be66ed7c6d71de9b32aad1
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 17612 bytes
SHA-256: b2dcd31c0e151c7a2a62d63cfed41928a9a3028c9ef3beee657c8a212b7c2bb2

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