Malicious PDF — malware analysis report

Static analysis result for SHA-256 7789b25f41dd452e…

MALICIOUS

PDF

79.8 KB Created: 2021-06-28 15:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 391f4025e58608a13b2322df053ccd83 SHA-1: ee89249d717744b3c145f82210fb0f236dcba65f SHA-256: 7789b25f41dd452e00f197e1d35c13acf242dcd017253ea9a2b7ab175796f034
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://0900107678.com/upload/file/57048882219.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3266c1f18e---8175888200.pdf
    • http://www.annaleehuber.com/content_files/file/15351246560.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160850de40c914---wozuwenukoxedukewimuguf.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/47573399996.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cd5vh3jr1g29su35j5vkifd6t7/vafujotinuvilenuw.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sfa441ac4nantfmilru9hk6cu0/kovenijoxepi.pdf
    • https://mangmalungtea.com/userfiles/file/52897659312.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7561342a4fe73039db61639c661060b1/zawovutomes.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/rafot.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8lu4gk9172dcrf18p5eqek6jt6/filitevokijureva.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8208a0625---tazonudafirixaxis.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f2a3b46ed6c47b02b057a041e6f2fa35/duwadokakitutigukesu.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7720cd85---19617483192.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bcce21f9a6236873e68f895ffe318d6c/fawiwomuregaposefiginesas.pdf
    • https://bamfieldrental.com/userfiles/file/15810953976.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rsso8eibcm1l763qfqevrjosf8/bomejujokora.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/96790642920.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609af772e17f3---sotuwawusudabupetovugonen.pdf
    • http://scheiden-maassluis.nl/uploads//file/pizekufitigekopep.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608259a7b93a7---56146498317.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072567f8ed63---44318843131.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f0100cca695d2abf17a25800444d332/jasepe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=los+agaves+grill
    • 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_off0000d7c5.bin
ac81963f7e42f83dbfe3583efd64a95909ac0334f17bed740604de67d85e47ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10104 bytes
font_01_sfnt_off0000ee66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
font_02_sfnt_off00010678.bin
05bc45546256ca24e17658591f8e5fa3aed4f6c66f4ac862b5673a7a2ab9a360
pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16940 bytes