Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f28b756d051110…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 12:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cf50c815d94a10a56f6ae0affa84b9e SHA-1: b051de46c1de6daf141bd855e3a23df37e371e46 SHA-256: 47f28b756d05111033748250ccadf30e112fc92b1f8383d5c779b34e34cad5b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or credential harvesting campaign. Embedded JavaScript was also detected, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=rockin+in+the+treetop+all+day+long PDF link annotation
    • https://digireg.gr/upload/pujofaviwolib.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/25032230778.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/wudarudoxibubesunavoluz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e0ead62a---ragikijevunokoredemipix.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/38884590149.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/67721952294.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/tevele.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa54618ce6---64152581790.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9201a1c2---tivizizemejumadolez.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/sisonufonewosupejip.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/55046895403.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/02db5ec84d636b8b72d3e69a8d006221/98050786960.pdfIn PDF document text
    • http://palami.by/images/file/66641708337.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/893999e06ab5090686c0173ae2969b02/10103502781.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2e9eb6bc9---puruvige.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/505ca916fc5e57bc278bfdb61ced919e/64527507574.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210502174755800780b9ch22.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/sukiguruxolab.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/xanitokolapuwofetokawaze.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/67799342264.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8135b2bb6---tosumiguwusu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xawiseloded.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609deebe3504a---10552417036.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/binomitipazepuzebu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217152036205858.pdfIn PDF document text
    • 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_off0000c1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 10876 bytes
SHA-256: b90db89f18d90dd7db5421316bca10de5a24bdbd70498c7af2cf7e07008b4dad
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 18832 bytes
SHA-256: 55e89bc26b1881fb073e0ff2b840892816caadb26dd2618d3ccccf6aae2c6bc9

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