Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec42de5088fd441…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 01:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b9473a6d7f13fe96efdbc990c90d334 SHA-1: 42f8ff76d39c8069faf19ca2d811a8f8dc2ab95d SHA-256: 6ec42de5088fd441e967ce3f5ba4972284affb2b6314e3459b10cd0861856b63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://cructi.ru/uplcv?utm_term=imaging+for+students+pdf PDF link annotation
    • http://sllight.ru/design/img/upload/file/15133379886.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e5cb6be7befff4ef99262cff26bb909a/84477569437.pdfIn PDF document text
    • http://martonelektro.hu/files/file/pipukijeb.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/temapiwenapera.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733e6f61cb7---databulupabo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/81768792987.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f994bdd321d---momiruju.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/86400669956.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/54566810802.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c490b273---99597251455.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xelozobepom.pdfIn PDF document text
    • http://vtaky.sk/media/file/46180269843.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mekebomolakuta.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5d581e76569a0046ce186cfaffbe900/77436993921.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/giwepog.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/76682ac2b8c1caeb6b4bae68a2e6631b/pogivabawasepetogabowam.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cda50b88---raxugigatamapalobuz.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/jexatexedo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/b0e1dqppgpm1a5q2vpuke29kdq/92610780801.pdfIn PDF document text
    • http://ranch.pl/files/file/zapugekigubemumigenuzoxo.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/74703614202.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufijizodisezotutixow.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/nisewij.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4juh8cqe0s15uu70tn5mhi89j6/635413017.pdfIn PDF document text
    • http://kelsenator.com/userimages/9033917950.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/79389905665.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515190634_1739797416.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e6dcf038---46061720978.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B8 18044 bytes
SHA-256: 9539120579fa16cfc4b0d6b2d7394735c3ac4fd7839bcfcb6813625315d74d4d
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 10844 bytes
SHA-256: 033bd6a9f66915d326972cd3fdcc6baa59e4be2ebc1c78de0ae135807dcfa41f

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