Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c6600930ce79d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 22:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 690b849c96b244a10ee7a75e6fc73ace SHA-1: e398db3654900a5a77d39344e6e5f5fcfd1c3bad SHA-256: 981c6600930ce79d8d22c6ea7a7262491858ed2d1c50d6d718dc2f4f2eb8eebd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to WordPress sites utilizing formcraft or super-forms plugins for file uploads, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://archism.ru/uplcv?utm_term=my+android+phone+is+charging+very+slowly
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd328bcf3---2966005433.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a064155d45---busijeja.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a280ca3b3.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3ildalo8osf8jcs7nnii1s881s/56650561755.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/xijobedagixurapi.pdf
    • http://golden-candies.ru/webroot/files/files/dupebiduxupexa.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/83401473837.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/jadibatozejimofug.pdf
    • http://elpijisystem.com/file/18885508066.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/73476495641.pdf
    • http://tdsns.ru/userfiles/file/35828179598.pdf
    • https://at2-turbo-j3t.com/contents/files/jififenotelisusi.pdf
    • http://dastone.ru/userfiles/file/votop.pdf
    • http://frankifoto.com/uploads/pages/files/lanefapemavovijovura.pdf
    • https://investincarpathians.eu/app/webroot/media/files/lesuxeji.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/88780608907.pdf
    • https://premium-house.uz/images/file/41293481029.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/barotogeke.pdf
    • http://moonlightmontessori.com/upload/files/navazafukurajo.pdf
    • http://studioingtassinari.eu/userfiles/files/49963848998.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210906202859795569x66ee.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3870df3a---poxojabevuvazeserutenesom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96e.bin
05f5de8e00239a9e05c10eab939b910561dd8ae52a7849b4b0b8fc4c98edd734
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10952 bytes
font_01_sfnt_off00010292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 16792 bytes
font_02_sfnt_off00011aa4.bin
a58bd06213bef994dbfe274ab65623a028acbf6965065babb7fe892d8a87328a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 17632 bytes