Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecbdde0950ab242…

MALICIOUS

PDF

84.4 KB Created: 2021-07-05 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c4a729736ec05bab62e00aa6470c8ae SHA-1: 080c5a627d932703b130d80eed1ccd60ca38d515 SHA-256: 8ecbdde0950ab2424a94ed6527832cbf870efd1d9e1bd7060adf61013474ddf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pivotal-technologies.com/userfiles/file/16901345144.pdf
    • http://amandamaitland.com/images/file/44644917848.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mm03e37lft1qr99kufnfj265k3/suvidoluzeboxifegegu.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/pubujibetilosexa.pdf
    • https://charterfori.ir/basefile/charterforiir/files/84443092945.pdf
    • http://tamker.hu/userfiles/file/bezotukekadiw.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5a7510489db432582645f2e37afb80c7/gubotogamuben.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/uafbuughd8cm2gnt1a1708e4r4/nazumobowoduzakez.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fvle27npj7vsmkn4mp5bl4c0j6/70185845877.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/sovesel.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/73213027143.pdf
    • https://paperland.bg/uploads/file/75634740048.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h1kdtu8153vngp78tbbakmls1h/81126881490.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16a2456f8---zuwipikerijopijewanijo.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089795e2f72a---xegepizaxo.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c23bcffce---9345169294.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dorjhjq3ea793j19fcm2kn6k24/pipevowusavuzudazewos.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655ef213ad---fedutolaloteja.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53103033a---77846679105.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08e88e063---84538531721.pdf
    • http://appletechsolutions.com/userfiles/file/15280785439.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/931f68b95950d03986460938f59e6b21/88377389017.pdf
    • http://aucoindeshalles.fr/menu/file/89770343747.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3fdd255c---36203766755.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ho+chi+minh+weather+hourly
    • 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_off0000e757.bin
9e196e2d09332ecf9888e771cb96dc560d1ccbdb8539f843a760d3e91ccd74db
pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10616 bytes
font_01_sfnt_off0000ff71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes
font_02_sfnt_off00011783.bin
e20b715edd88d6f65613bf280b716e66066c5381b9400d819fa1f965f9c8eadf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 17296 bytes