Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7399767954405b4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9b66f6649c5536a5fc8067ccbcb4aa3 SHA-1: caef06c6d8e074e6a29fe52741ae44cdedd180ab SHA-256: c7399767954405b4e4b2b3fa9c2551268cd2150d36553c59add9fb7263c41af0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to potentially malicious PDFs hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves a link farm designed to trick users into downloading further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/22a1cfd35a356a9e36987218b569554d/97515451091.pdf In PDF document text
    • http://police8coop.com/UserFiles/file/43111336572.pdfIn PDF document text
    • https://fishuntpesca.it/file/50804683804.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/34147658309.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/40463081878.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/59673322224.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/60446472236.pdfIn PDF document text
    • https://computerzone.pk/file/gabofuvepul.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081819093997.pdfIn PDF document text
    • https://redac.ch/upload/roranonifuma.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/39910402804.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346d896e7b4---sibetaruperinuzojop.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.pdfIn PDF document text
    • http://17njl.com/userfiles/files/67995804220.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/12403513032.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/zurijovivo.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/28652288787.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/978cf0a3542957b5d609bbdc008485aa/61752843158.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/44614282835.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/58508494001.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fefiletibemebogeg.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/57341719300.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0efdccea---loxigerubeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tap+to+apkPDF 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_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 18268 bytes
SHA-256: 94b2de7fc84e99ce4013a3120c1b1bbe30d4b98d2b2859bfcd415473109bebdd
font_02_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 9660 bytes
SHA-256: 5dde614c9c9f542a50ce103ca01efd68f2a8172535c4c7178a2f652ad7f48df2