Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1966608a816c626…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 01:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d267806a1f0edbcf8be255d2fa047fb SHA-1: 32e6729aa1f8054c5a9c44847976eb62911eca72 SHA-256: f1966608a816c626be37d76686d3278c78bdd2005907f2dc241b998d22f08bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attempt, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nbkhjc.com/uploads/202108/file/21080103510361358257npbi2bbdbt.pdf In PDF document text
    • http://gamjagolla.com/uploads/files/vakuteg.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/zasubusumubi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee9c3f126---nabovejigeluwozo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7rvuftctuso4scnqan2np1kse3/bevexi.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/29545433272.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/87547709662.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608021326fd82---bowixinuw.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607935ee3c7c0---dobeb.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a959df0f35---totulu.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/50217190124.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e78ae2da63b---xojogotowulabawezusoforuj.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/81595507994.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812d0f6982b---27893546218.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/38462318324.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9582cfb72---50008159093.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/30914401145.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/77297429471.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nazoseb.pdfIn PDF document text
    • http://101balkon.ru/upload/files/remiguwogupasapedil.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429012408131.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/tivawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nonlinear+equation+examples+pdfPDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 10984 bytes
SHA-256: 7100e9b12b03dd720f95509dd8140812b5f5c5b547abdeaa28aad1186d7b2575
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 17932 bytes
SHA-256: e28183ec7dda5363851ded43407f46aaf4d32b116cf66f270e712de439016b04

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