Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4abcb1d2fd221c…

MALICIOUS

PDF

92.7 KB Created: 2021-06-30 04:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbd0292ce5b415940ee285ee9a9db92b SHA-1: 0d21c1e9529f1aa122601fb670c8d69c462130d6 SHA-256: af4abcb1d2fd221c9e2cd2d2880537010126e69d86c0e6c2cdb82859e02366ef
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 WordPress sites 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 malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/skpg15u9b4ch65bqufat1mu8pt/33318784226.pdf
    • https://nhadatonline24h.com/Images_upload/files/wafokoki.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608792e7de57b---sakonosolemegum.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/batuwifilebasi.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2815380fdd7ddc59e0ec614bb56fa917/nibunevumokofufemujas.pdf
    • http://stlnsk.ru/uploads/file/11524263857.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ec4c8866e5de63be081cd63286e3c8fc/55858319854.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5b4397ab84b8f30e342f96baffd127b7/repakimefo.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2489813c---11805701488.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b451e45b0---56781211897.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc88e304d5---22615689219.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f6636fc5---senupevuzevufunezep.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/pubevolufuvopejezenawego.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4oo9mis489olldt8m3ies535n1/91511697255.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653ae72ab5---lanaxikidifape.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85776f0fd---bafejuvabimojelopet.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf644b2420---18117047087.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdf
    • http://garage-fuji.jp/js/upload/files/najupogakadogozirifa.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce22d6ae78a---ruzokoraz.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/830743f420ec00d5d13596f6c15c53aa/58932856110.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8otnaic8d7uv8blivr1mle44k3/71582094204.pdf
    • http://app8itebarandgrill.com/admin/images/file/74972324529.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed307969d---9915091010.pdf
    • http://thedewakohchang.com/image/upload/File/ifurilibixasavuluwu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ca77947dcc824bd0d061576ee261467b/77986975874.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gb+to+mb+convertor
    • 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_off00010860.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
font_01_sfnt_off00012077.bin
6926a18adda143f91edc8646336064356260a6ca3a1f3d816e7158f738ead83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10168 bytes
font_02_sfnt_off00013736.bin
2d707311c9be6e5aae0950e861b0f49587b263966120f351d5c947b8593ae5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 17616 bytes

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