Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b291064ee365eb…

MALICIOUS

PDF

82.5 KB Created: 2021-08-19 02:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73bfe12f09211b0057e082be7bbdca7f SHA-1: d7a0992679ba3810b2c8aa1a21648696f404422a SHA-256: 93b291064ee365ebf0e99412372d3e1a8fab27b848f08b9d72333b6f2e06061e
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=primary+english+learning+pdf PDF link annotation
    • http://fontanarosaserigrafia.it/userfiles/file/56298554835.pdfIn PDF document text
    • https://anfauglir.com/images/file/60132807769.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fb4222f38deaac1cc35cdef525d9fa19/lumupireseposulezawi.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/34437078504.pdfIn PDF document text
    • http://school15-tyumen.ru/f/91041726840.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vigezulafisisenukela.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714730b4561---xonefewoji.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/82a50f12fced5e53ea0d03ffee14902f/jomufipigeralulexef.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/xurajogipowiraboradeb.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/c2j2nbiojqmraukvnjerjhei14/gebolujovip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8fs6rju2kah0f0lk4ealrqim7/nixuraziv.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b1396062---73899070739.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6fce906ff---52411047765.pdfIn PDF document text
    • https://eetravel.net/file/xuxukeninozo.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/xedejodesalafim.pdfIn PDF document text
    • http://ubest.ru/images/file/55000106873.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/398021d664481ede13187e390506fcb7/73107684267.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895cfd1a1a2---45767617868.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bc360a8---71604918018.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7de713d6f---35464889217.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/pifomowuzebi.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/vogujun.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/zubozukajojifebizof.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/50794137631.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/kivudibapexosep.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10840 bytes
SHA-256: 4a742b706d6f7f87b92f15a9fad95e6a30a78e4712e2a5fe48075ccab629212b
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 20012 bytes
SHA-256: dfa1edab43acf535b9148da56022759d76ff2196012decbd51d4b8ac45f8129c
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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