Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fad392712a07c0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 09:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edc29af80fcc139b7314de503ef5a09f SHA-1: fd818820c2c3b96f799831ad722311aafba410b1 SHA-256: a5fad392712a07c0bcb700a7ba46e87d4f399673178c7abe1fe8834012538e94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://puisan.ru/uploads/file/mapupu.pdf In PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/70050260343.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcotj16m9di71cq195ubs22377/19275497812.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lafufupexojematilururuzi.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/55355343259.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130916270d61---3594966258.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/77939848986.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/97421881783.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/49463885006.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/31411015196.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/24150568841.pdfIn PDF document text
    • http://dobermanncz.eu/files/titamab.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/34271913240.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/wesig.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/56396958011.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7a0291c---51685775463.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/razuralexeniwagugolar.pdfIn PDF document text
    • http://allycatering.com/userfiles/tejimidofu.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/49218081765.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/gorutebuwozepojulofepixon.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/14152567805.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nfo5nl4irf8c8nva4hm1lqe7m4/jitoji.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/xibudeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+the+eyes+don+t+see+pdfPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 17588 bytes
SHA-256: 000b48423e3fbc304bf2223d36abf8f40acb4c6127fa73f900b7014ffc62ef04
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 10464 bytes
SHA-256: 99c18694a9bd6819b1d65158e3cf6c425701ce90d5ad657f6940451506bd911d

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