Malicious PDF — malware analysis report

Static analysis result for SHA-256 827db5c1daa419a1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 08:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d27e20b5d3a5242797ddaba232ab1213 SHA-1: 31269985f22f7609cd5df3114424f0e0aed4c565 SHA-256: 827db5c1daa419a18096ae37e93248c7fddc080f109f3a67e03e24f4929b1ab2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload, as indicated by the 'PDF_JS' and 'ML_NYX_PDF_MALICIOUS' heuristics. The presence of a link farm on disposable hosting further supports the malicious intent, aiming to obscure the true destination of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://sushiloverca.com/uploads/files/kitisaw.pdf In PDF document text
    • http://autoscuolapezzano.it/userfiles/files/89335836011.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1a7388fa7---27741970557.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/20725955094.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d62644a6---38973832167.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/kelabuwabosewiguxidunepod.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b385a1b3e---zusepixetofigojipe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808faa3a528---87383447310.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/812387103.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/pularexum.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/84533867490.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/wuterorefuwifunexila.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/bapavinunorozixekugomog.pdfIn PDF document text
    • https://angkalaris.com/contents//files/wilovariniriku.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/58908401593.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe5678aba---42942288455.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d3b3d4ab---bivedukarekatunevu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sevebumekejazidegos.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mpbk1jcsurbim7chgas5l4e4q9/dozamamatoxijagezuru.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/11103503184.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/katobobuxuluve.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/jokemoruxem.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/12557387785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=configuration+outlook+2016+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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 11060 bytes
SHA-256: e1c5602f2df5f1bac454ee77519d57677b40e992f3a73313f1998e6f6e38a7d1
font_02_sfnt_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 17496 bytes
SHA-256: 87c3770df75325720fc22af111d812e55887e7f7ac8a3c124e18c7267f4b5984

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