Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f9b45162c0dc3c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 05:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2207cb8c201ac9ce3ef8cce651dbda8b SHA-1: c773582ca2dc4d3dcc86685b66bf02c471a78ac8 SHA-256: 90f9b45162c0dc3c24619d781675414b6896ba9b4077a1333932208b7d8235e0
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 websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript is likely used to facilitate redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h50dlurvs0jtv62iivjer06mmc/jexetukulizuwopu.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613785bc3b079---kowexaramomopob.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/76959029985.pdf
    • https://veaodaibrahma.com/uploads/image/files/zupivadaverofolej.pdf
    • http://yilip.net/userData/board/file/xibufaliw.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/65269403386.pdf
    • http://shesob.com/file/files/vetidogudewifatisora.pdf
    • http://birzebbugastpetersfc.com/files/file/33816555804.pdf
    • http://bmfjhjk.friend-match.com/upload/files/48288882512.pdf
    • http://yds-wcv.jp/free_images/files/moguw.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/82512995487.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/sotarijilenopuduripijuru.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/mikitoraletenu.pdf
    • https://mkart.it/uploads/file/63091557630.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/462b3fbed618a99afe0b0aab135b755d/387418411.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zilinizewivikosigu.pdf
    • https://ecohort.com/userfiles/files/37923418396.pdf
    • https://kolegium.inaheart.org/upload/files/45662932245.pdf
    • http://forma8.kz/ckfinder/userfiles/files/wiriwun.pdf
    • http://sanchariglobal.com/userfiles/file/jikidopufukimabuxifazo.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bror4mojs7j0rf7p6u723manq7/zugam.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/46174649628.pdf
    • http://orem.mn/uploads/files/midinamam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=play+store+app+game+app
    • 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_off0000d9f2.bin
da870c13fd113d19c125a913f768aa7a69040ba2eee0052435cc13bf7d7c6081
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 18548 bytes
font_01_sfnt_off00010a7b.bin
584c327dec4789c3b33b1f19a939386e5751e8b4dbb9fe65f85827ab50f0ba0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10516 bytes
font_02_sfnt_off00012296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes