Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8356eebf24c91e…

MALICIOUS

PDF

100.0 KB Created: 2021-08-18 00:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ca66293ac88e6e8e23c394a1f74f4782 SHA-1: bb2c4c3f4894693a8e7945816d97a9b3ce7594c6 SHA-256: 8c8356eebf24c91ef7788254e5de7496fc148e362fdfdc8569e765c4868d4ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely attempts to redirect the user to one of these malicious URLs or download a secondary payload.

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 https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pn5i0b20ovjasgjq93amjbr3u3/45483280042.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/demisuzur.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da34e60ea8---70278230503.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc9569247c68a3ac77637d67fa6ca05/zasiwuvukewaz.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b895a2e97a66a6dab30f122ca5ba22d7/44080004981.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zepamapovujebuw.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ba7e69e6k9lribidu2uimgnvjh/45999964630.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/80914026619.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/30561482111.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fajakasukikexa.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/20598646061.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5070a3f9355c2d82edd2a6e7e40bc570/xomexerozotolidifamutaxu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/xenogegukinedig.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/pokulodonopire.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kiveguvubikutevex.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a10a736b---tisevipuperenapiguxulomen.pdfIn PDF document text
    • https://capecoralliving.com/media/file/pezefigawalok.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd869f28d---tabekasugurikezi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fac18b51d---kuxizojamutovot.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/jegumiwiwuvumidetugef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f732b12b9---xedafeke.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/lexevaduwagaxu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/lrbbdb7kupsmggim3s2h84o0sm/mebunijik.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a060ba3d0b---7577951074.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/wupetilupitejopovukupiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ansul+checkfire+210+installation+manualPDF 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_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 11068 bytes
SHA-256: ad0e436eceeadafc4023459801cd4e23fd6d5427c0b6525e3b531c1d7f5099b0
font_01_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 17600 bytes
SHA-256: c61ca75261feef63acadf5f1996c074bd631d309e6bc2295485172729a23ab75
font_02_sfnt_off00016732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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