Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb30d7887262c8e…

MALICIOUS

PDF

88.9 KB Created: 2021-09-24 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23c86fc9a6446eb5676cfbea35f9b73b SHA-1: 63502a001477741e28cd881e306f641fcbd281ba SHA-256: 9bb30d7887262c8e693c930fd08f001b4bd9545a552f225860c41fe31ca13cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+to+unlock+my+sim+card+iphone PDF link annotation
    • http://factory-01.com/js/upload/files/16321733489.pdfIn PDF document text
    • http://jawarakreasi.com/file/rudoraxokuvogutisisa.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/90471920834.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/resotevutixip.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ja6q1s8goe5mf2pjpdbc3scvr1/36379919335.pdfIn PDF document text
    • https://derfo.info/resimler/files/zevum.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/rubogunegamipigezesak.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/17079090776.pdfIn PDF document text
    • https://msiutilities.net/documents/bavetexalowekubafe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5679cbc24a1190aed5f617b3302e872b/44523271828.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43604030802.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/11990391361.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/1551918864.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/xodorutesisapupepobi.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/70698506696.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/8772142164.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614177b5dea6f---talawefilorobikewex.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ad0ea08c3aa28ded7d659e0743b2e4a6/62742260704.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_DAF5ECDEFC17E54F.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144696a7054c---lifuzag.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80081581286.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/21083144923.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/bopejare.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1eeec0674dc9f6e3cd5df82b2aa7ecc/28023024644.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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 11160 bytes
SHA-256: 529622b2598300bca4cb9d92848282f0a032d73ae163c83217bd7c2074d12308
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 18464 bytes
SHA-256: f0bd026070283316e1e7a841d4dd9311255553f0eede6f029b508ccff9b33d13
font_02_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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