Malicious PDF — malware analysis report

Static analysis result for SHA-256 94279659a4e9aa4c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 18:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 241b4f4e2b39f367cb33b76dd50cf39a SHA-1: 2a3ea7772a17815ebf9a50bde855354c7b11aad1 SHA-256: 94279659a4e9aa4cb3f3ba2f746b95fb16fcf99921ebb1fc527f2144a1d3804c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The embedded JavaScript is likely used to facilitate redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=can+i+transfer+my+iphone+apps+to+android PDF link annotation
    • http://aktasmatbaacilik.com/resimlerfiles/wipinatodonedofura.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vadiwutafokonan.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/4853166364.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/64794b377fdbcf94728291ab0a91c40c/47530927573.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/semojibekijonuliw.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/69981283702.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/37591094224.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/066f7fbba5ba77b1c79a2a4aabed1f69/dapalekadefedefepumanog.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/votamox.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wizogam.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/53984107468.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bovalagipeworofipota.pdfIn PDF document text
    • https://linker.tw/files/28958164167.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/93705098388.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/39071614433.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910120944556742.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/gitevufezasifexamitimejom.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/jituxiroponisotixi.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/45343033539.pdfIn PDF document text
    • http://isgsrl.it/images/file/40751371574.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/feo3e6vi7cbkproeidf9a90o70/zijogoxuvofofo.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/11108303666.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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 17176 bytes
SHA-256: afba153f5914c3d47abfd8b0ee50a7a2737b2be0e7c0e1de700a6e1f14fa57e1
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10860 bytes
SHA-256: a280258a1d1e6f65e66ebdd29ec38d40866a8a38d5c5bf4cb221926fafd99ef1
font_02_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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