Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c008d3653ccea4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 15:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2367eb353c767db7e8daac1a58c2bc0c SHA-1: 86f644fb411d9ea07000e3149a71f0a6f8b81e36 SHA-256: d7c008d3653ccea45d4c3fcab027e3cfbf7ab3f3015183b6bc81bb3ebf443679
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. The document body is unreadable, but the heuristic firings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://wabasnb.com/files/fckeditor/file/214583140061436c470b8f9.pdf In PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907005204500031.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aaa5fb35526067f5e6e98f3410ce4ca5/23381769767.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h3fgba00js6ne2918ehs8ko4nn/bejopumapatakasafita.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gukiwijuxomuxapiw.pdfIn PDF document text
    • http://goldia.cz/data/file/11318782905.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/puriposumopifirenapaba.pdfIn PDF document text
    • http://masonhn.com/d/files/55678768703.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/gariluxomuwevivuvudal.pdfIn PDF document text
    • https://beaszemin.com/files/givixomigugazoxir.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729f60499f---42612354391.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/finuwosax.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/lugira.pdfIn PDF document text
    • http://puisan.ru/uploads/file/kafazagetir.pdfIn PDF document text
    • http://dytac.hk/userfiles/woxojizesogefe.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/zuruvokunexusimo.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/41310041661.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b146d7f16---zokomozatejonivikevakizo.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/30202369986.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bijukedakixujomefaluwu.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/55976543666.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/lazutibudebe.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/5687304153.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/79280475295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dirt+bike+mod+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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10468 bytes
SHA-256: 1d21d77b9942c3d1f0b2283d17b285a350579fdc7d76f96c4bfd3ec48234d81d
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16160 bytes
SHA-256: 0beb14d4d96a98f9e9e9827e27c6a5c559a8435d55dc6e07cd348e0439a77b5d

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