Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca1349bd45ef084…

MALICIOUS

PDF

86.7 KB Created: 2021-07-27 00:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97159934b5ce09fd7898915b7e407ab1 SHA-1: d7a5081779c79c0550d70352faf46fe4f45edd25 SHA-256: fca1349bd45ef08409b3f27c9509e7aa44f66a0aff3566da32aaba4d5c934ecd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of 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 0.9990

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16078796094f01---lowadunujebibazopatuta.pdf In PDF document text
    • http://ankaser.com/userfiles/file/41384248387.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nomatutirizagusaxovejiv.pdfIn PDF document text
    • https://noddy.nu/images/file/robakowobojovuwidefuk.pdfIn PDF document text
    • https://kawanmto.com/contents//files/3542552669.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/24444884355.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/30693781406.pdfIn PDF document text
    • http://domplus.su/userfiles/files/wazuwipovokalus.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/796216533e601a1bb6f44c0afa95876b/senonate.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/peleset.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd0c8c5b8---jurimaderuwuko.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/17359587640.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/pufisibilimuvigoloduv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9b7abb5355dd848e1214af208c855111/36070521304.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/filasefajorid.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b4o42b5eavpqv9n1n99trk2v1l/27058266222.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lagebumunabufejojizonij.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/23e7697e8d929fe3266d5ba112d815e8/zegenibukujarisuvutegozo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/6421598981.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0b0d83993---73092572735.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/vufurovawudorot.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/39405092238.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fevizogukapidekew.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7eb307c899---66163143886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dungeons+and+dragons+pdf+monster+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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17268 bytes
SHA-256: 11d1bf96cd3a949f966ad0c10a58bfe7bef4ff2f46478154480ceaaa4288c6a9
font_01_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10848 bytes
SHA-256: e502d003f180bb626aba60c7927ee15aab04df047d1ab423c437d95a87a51c3b
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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