Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9fa97bf2cb3278…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 00:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2ab212979b8387f6338911c473e2be1 SHA-1: a0e6827310ea48404c0bdcc7a08c9c4547ae6e30 SHA-256: 9a9fa97bf2cb32780fe24e305b5b628634aa7c98b21480fcf7da05261a7e13d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, likely for phishing or SEO poisoning. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://goodmix-psc.com/userfiles/files/3340053846.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/nosogarojixatefutifi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ebf00c75dfd93209cdbf656c44e4aece/24603131730.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/kewakuxafedo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/bozopewedirisupeku.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4987a84124---jajikotopudevemeboxaxa.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/21390309852.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zaxafamevekagazedib.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2e0c2a663451078df8adca23e014d76c/rikupafagijasifofi.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/67842467852.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/55278310144.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43e82bd879952525259c45d210b596a1/ketoxaf.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wirefij.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/45296130004.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/79550652017.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/27683658523.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6n6n2ams18g7iq89b32tabdc95/25623459813.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/32415870254.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/54688088320.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ec76b660---nuxubojogifajesulavun.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/54ce877a3f41265fcad6a273c140c924/78496693915.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/69698511282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=focusrite+scarlett+2i2+gen+2+manualPDF 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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 18836 bytes
SHA-256: f4ee1ad8d764533cdab65f9f39d93a10d6dbcba8e45641ba81bf5111c70e2f16
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10768 bytes
SHA-256: e7dd366172bc7e3317f9b26b983f1cdbbf9096b8369149b0d1e9e0a99b3c87d3