Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16135bcb3ee81d7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 22:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f5c5aa06a9aff8116c7fcce72aef0e9 SHA-1: a9c1d2c53c59b5739cfff3e166f504dce11799dd SHA-256: d16135bcb3ee81d7d010bd3b26146a79901e79b4d82eebb46a1689189558f561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as a malicious PDF. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to leverage compromised infrastructure for malicious purposes, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076056311da3---zefixajiv.pdf In PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/bugimi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39d86a320---gorivejosupojibisegazel.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3426618dc1---pidetugu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ecd79839a---73374276538.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/40638617475.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a48dd512---sisevibusebut.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea5280fb922f41d71d29cef90efabce8/viwiv.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16077192b3741e---towapogixaliweda.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/25824383228ed960a2c841251ea41fac/87480502066.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a87a0cc80---82656549562.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/v4fmpk9d4vqot4gu0tb03jvg17/fuvezidevigoganaxubetoweb.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/lobg9sum7oqjabh25l909irhmh/66657788584.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086578fdd8b2---97391083681.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/eb90qp2br9uo5ih3qia38iod35/75730219.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/duvigovalan.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/38be4e82a0d1563e57e85500f92436dd/zebubuvafinukul.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160846d08a2b98---6092658134.pdfIn PDF document text
    • http://eminencesolutions.in/resources/userfiles/file/88974050111.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4511958f---60653847.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/nuzotodegenewabagek.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/damifemeturuvibib.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/25e3c8fe4e3b50e59b3675ecec16ac76/jizokunog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=relationship+between+pressure+and+boiling+pointPDF 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_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 17384 bytes
SHA-256: 1c9e65ab2e6bfa1d9a61ee8258b5a1aee62f41cc90cb98157385ff0dc9d5b4de
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 11040 bytes
SHA-256: 2d34a0b802f4052bf523c15c8e648dafcdc387e9836437b2d1df39164020ab93
font_02_sfnt_off00013b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.