Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efa1b0c77a9e556…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 19:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29640ba09a735778e9410c858ca228e4 SHA-1: c4bb0ecf4ad809f91dd3fe2993fe31070b7e4d5e SHA-256: 0efa1b0c77a9e5565a2699d85fb0db00c76230a080a50dbce17f725e62a10b17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=organisms+and+their+environment+pdf PDF link annotation
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/dukimidup.pdfIn PDF document text
    • http://lj-group.cn/upload/files/18935043924.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xinefibaxujiraduvafubisi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/98013160245.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd1bd0a8a---jojevinovazodugusonav.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/fakeseliw.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/16462946478.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/76394166467.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/zeposuxos.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/54742395970.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624672389.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b6c48febcf3f692644c2069e1ef0ffce/40001333728.pdfIn PDF document text
    • https://aneri12.eu/res/file/jaxeleli.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30810349960.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/75918903867.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb01b6212---woboso.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/57207046662.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/58546486613.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/xuxixipitipavafevorezaj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0563b0df0---54094818324.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/bitofi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e12a74af6ff---92336039680.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/jepujamibuvujera.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/62144906235.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab2f36511---gibozup.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd9bebd58---vuzibabizosuwejunerudagas.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9fec0r67sng0qdso8ec8mmvpc4/gemozarasutolemema.pdfIn PDF document text
    • 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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 17708 bytes
SHA-256: e52e11a69b2bcc794bf362b8c32f6e03b6f6b14b0638dc4ffde84ee66c756f82
font_01_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 10992 bytes
SHA-256: 210b1e109670c2f4c9d7a8cb064f54fea42cd7805ffc16f1be3a5ada276086f5
font_02_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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