Malicious PDF — malware analysis report

Static analysis result for SHA-256 9566db8ba9a7cb9f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 04:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4673458b828aea50ca451b5eabd434cb SHA-1: 23ca792e5931ac2a51780e08db1a30155799ad1f SHA-256: 9566db8ba9a7cb9f9e028622997581fa1a7fc8352c945c89fa28b95fbef7b643
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 ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised websites that host further malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://namlinhchisapa.com/userfiles/image/file/tejabivusokus.pdf In PDF document text
    • http://studiodrago.eu/userfiles/files/degezamojogafet.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/6982912501.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e748d255ca67b3a01b9fcd8af2202cd9/11276826161.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/3d9da089069d0b477a29bd4079adb6e3/29269268652.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292d779208e---41642851812.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/bekibilapewezemagurukiv.pdfIn PDF document text
    • https://doganagolosa.it/file/3966773006.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/85339463314.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb20b1565cf---loxagorumet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c95392a2b---40794867466.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64478616220.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13e888a76---44480295771.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/19246768441.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210625020544.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee13bd1c13f---45262362126.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/16346214256.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xalozezetekirimalamu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kigofomi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a63136a5790753f55215000412b4c822/sevulisom.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/vodibi.pdfIn PDF document text
    • http://dalaichau.com/files/pigudumubogav.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a90bfdc1fb---busanojitapumujafokifumit.pdfIn PDF document text
    • http://splogservice.ru/content/file/loxositaruguradibi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/768e733ed2a13580987b2201e59dc7d9/48997334027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=numbers+1-20+english+worksheets+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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 17008 bytes
SHA-256: c5c798b93a01c2ef4940758766b04b96b3eea057e7395ff56c7eb28f53c36a3b
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 11504 bytes
SHA-256: 85d09a1e19ced2ea5fc9ec72539dfb5068dbf9f482ddabfb50641550592d20e8

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