Malicious PDF — malware analysis report

Static analysis result for SHA-256 633456de77f54595…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 12:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 915212e89cbcd6e3407cbc9a5d743d38 SHA-1: 1f9f486bc559bf05fa8038fe01b264221cff6d0e SHA-256: 633456de77f5459558b71c43934c78f422747b3278c63e6c72510274a1dc5344
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a tactic to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://nuitsdartistes.eu/images/file/46294774027.pdf In PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/70859825413.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/25824383228ed960a2c841251ea41fac/87480502066.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f3bcb45c---xaziruwaniniri.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jhairs9fducc6barbjj3026snu/45642945872.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pefidiralitaloga.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/60207614092.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/63005803009.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/guvarobojozas.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fujonaluzotijuzemapitami.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/vedebidupoziguginata.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72a004d31d---kemivezux.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/32389912742.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wimomabo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/ramitofalex.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/9770108489.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/patuwozogarisubetelaxuxu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58362651a---fiwowamajapik.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/52872059364.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zewepilowoxotefu.pdfIn PDF document text
    • https://emmaushuis.org/pages/kitigi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a1af9c877055672624d350514e5966c7/1094505858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adding+and+multiplying+radicals+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 17192 bytes
SHA-256: fde3bf2d59582908e3e469dd4927aa227acae1b92abaeacc4e0b1c59196745e8
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11336 bytes
SHA-256: fa85c0be13d839338d5a7697ba8b3fdc5322cde2c61d9ddb5c433863d62472d6

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