Malicious PDF — malware analysis report

Static analysis result for SHA-256 3326466e448bb567…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 16:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eff939ca91e5d21e3e8393b771cba6d5 SHA-1: 3256ca9cf53d12ea46b2217b7d6439932d8bb20f SHA-256: 3326466e448bb56714b544aa870840a2b914efa92dfab56bcc47e71ef20eb736
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dd1420371---51693905599.pdf In PDF document text
    • http://personnelstrategies.net/userfiles/file/xivalulalubovuzirolo.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zijisez.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e54298792---90136085177.pdfIn PDF document text
    • https://anfauglir.com/images/file/tozemidujigumade.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/slf7rfvknb3i0p6qtt365uhla3/41231637109.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9febcee5---kesesudekemuromib.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/doxoxoraraxomi.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/mazafazofogeru.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5ol6ug3c0js38m55uii2irnknl/91556112643.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/99833712373.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/22c014310c26c3ff4960451e0f54f6d6/lidewavaloduk.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210724_25CDB114A9624CA3.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/69323343435.pdfIn PDF document text
    • https://kar360.com/resimler/files/56137951583.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/kng4rkq5mc1pai48cu6bmd27a2/dufanewufunebopuzar.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/5849620727.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zovejarewomikiwo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/mekirojumelurubomexan.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210819095240.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/fanuvobosolug.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/h1oim7bn0fg9nhha8h77bouf52/29997502329.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/79120189196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+aerobic+and+anaerobic+respirationPDF 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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10784 bytes
SHA-256: 07e498592610d376342a58b3b30b590c38548fc01c260a2f7dc115799f52967e
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 16552 bytes
SHA-256: 68d2d5aa28ffd81b61ddb2fad5f85ea0380e6f8855e97bbbf99b2b983c191573
font_02_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1