Malicious PDF — malware analysis report

Static analysis result for SHA-256 d971daafdcfff515…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 17:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad193b0364670cca4690b00d829fa91d SHA-1: 886f568be0f3f9390c3893c86310a16b3adc1dde SHA-256: d971daafdcfff5155adf8d4e457d7cc8552c37b1d007795fa0691f16686d0485
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://atsrealtyvietnam.com/upload/files/keliwiwerumuvevosanopewel.pdf In PDF document text
    • http://lucann.com/Upload/file/42986617677.pdfIn PDF document text
    • https://tigapilar.com/upload/files/37971048416.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f8845b97d626256e78b7a867e54d97dc/dogavoxid.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/aac74ced9d9b1f4cfd5bbee08963b25c/9201494825.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tisanofufewolalen.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/dufitenanadu.pdfIn PDF document text
    • http://lecormier-menuiserie.com/www/upload/files/31853718761.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/zelujurowofumapepefumojit.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/34498811061.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-25/20210625225415641852.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c62d8da5---wadidoz.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/47d875527d2640895750b19f15617f04/wotewemurelukomafiz.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/73664762085.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf186bb983---93372307790.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d89032f8---51030513514.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3ee047f36d65f37e6d6403d8d5f76a63/pogosakubamej.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/97297374747.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/57215936129.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bopapeligesanarakirafug.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/rijetoromifegukajozal.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b41c2034---gazaxisekiluloleleda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=computer+networks+textbook+pdf+downloadPDF 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 18260 bytes
SHA-256: 2a87a7afd012768c279b68c05e3fad4a4313a14fe31956628a8b1bfe197210b9
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11120 bytes
SHA-256: 9e5778f6ee20a8b49d5a6401531bf4d186fc099008987fefe70c43a0be31d007
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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