Malicious PDF — malware analysis report

Static analysis result for SHA-256 182f512fa822ce53…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 11:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4660804faece6d6062abcb7bd79f2198 SHA-1: 6c6b46b372f33456b83c1fbc6c631f1b433a905f SHA-256: 182f512fa822ce53867e03b0ef6de32283a57b6a12f5f60df5220b0aa3345b08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bdcef472dae03386f6281982a07659fc/68317572104.pdf In PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/wipibud.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbc0b5e2c---20708587819.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/17492259042.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/42117906236.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mugopol.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210707_51B5B22D2E6CB71E.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kagelobirenopefake.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c571fej5gjvp1mmh6vsc5qn1en/fixeja.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bv417fb0pmig2gd0uucgj8ftq6/33739360820.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/89380295363.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa78f3b93f---3578693829.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb3de704---70398079996.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/6a8333f2dd5c799f3b3e6c6a73419e29/38089165338.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2603153f75d55dfebe216d1adf58443/88537996759.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b847f6c8f46---10548502154.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b2a7e1e6---8696069339.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ea528f66---28988655016.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779ee99be0d---25729788765.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/pogorawekopojasonutaxo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/38491069641.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kevevokabadagodejolirek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dukan+diet+pdf+download+freePDF 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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 10600 bytes
SHA-256: 089404a735cf2df915b50918c40ed859c462a1c17d82f53c07943c802f29fd1d
font_01_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 14404 bytes
SHA-256: 5fd43804c4f50640b8fe45c6d00b509b87b1d9cf6cb881d00715104c4be680a6
font_02_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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