Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b51a96a7ebc312…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 01:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7cf6fe4bab2f577ba11e84ce948171f SHA-1: da42c84345678a4598f3d1ec0657480225ca3815 SHA-256: 50b51a96a7ebc312381ea8d578e08df394098f866a77d196c12713cc43748ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially malicious content hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alajuusa.ee/media/contents/file/89886013800.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca9679e3e---81133025560.pdf
    • http://i-daa-wl.de/userfiles/57529571416.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/paeb7i2ib1jhjkn9p9mvcdg3lu/78704025584.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sernr1ncsejo4t35of1l5t3ria/30407725647.pdf
    • https://ipic.vn/userfiles/file/gubulapum.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34b24c41f---41272598826.pdf
    • https://al-farh-iq.com/upload/userfiles/file/sexufato.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160805d76d91e0---73318975461.pdf
    • https://emilline.dk/ckfinder/userfiles/files/riziwonojeximizudin.pdf
    • http://eia-edu.com/userfiles/file/3723820026.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/80ffb304ae38fa3e576ed7ac6f8a41c8/xikitar.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/28e57ea7eeac69d53b4597fa37d8b400/japavowoto.pdf
    • http://elitvorota.ru/f/file/gerupolosuxonajesimuxox.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6ed4d99656af1f2b4210dd9ad683cc47/306813710.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/52n61co4ub80uhp6mv6a6oj7k6/81605681308.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/er1l21gvvi7jh3t2she9rr2hd4/wazusutebesonevefavazo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89327ef89---zezumok.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4t836utffigjdtu07dsgp95h90/85841657152.pdf
    • https://devcons.org/uploads/userfiles/files/19780759469.pdf
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/93651293591.pdf
    • https://thisissati.com/userfiles/files/33157722831.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e76e3b041---95394222587.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a27298cba887e15dd55ab68c03561ddb/fexafedar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+pdf+in+photoshop+multiple+pages
    • 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_off0000ee7d.bin
317fbf1713db0b3a1a8f5ac24f04a11ec9ce55a9c81a088db0587630ff16c45c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 17312 bytes
font_01_sfnt_off00011b9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16792 bytes
font_02_sfnt_off000133b1.bin
79aede8b7c5e23264a23bd46f3b258e1c40d8ce2ccd31ad3af3b963a279d0d27
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B1 11088 bytes