Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bef602d4a30403f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 01:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 87483bd0bdffd65bea42d1601337b0f5 SHA-1: 1715d4a66bda3007ed9134d7c7578d791aca40e1 SHA-256: 9bef602d4a30403ff6113e4fbf62f2391d2b56823a017f8a5abf8748013422ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many hosted on domains associated with compromised CMS uploads or identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure itself serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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.village-gaulois.org/gestion/ckfinder/userfiles/files/91487769036.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/jupojemekubuvat.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/wusovegobulabakubukiv.pdfIn PDF document text
    • https://casaalu.com/luutru/files/79882819707.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/gezonufemiguvuwibexo.pdfIn PDF document text
    • http://caramelitos.sk/files/dorifamifezerofa.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/roronamigi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/getabuvasixara.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/13807849178.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/67223946f65291fd7ea51add1544222e/mewoxipawaxubosixoke.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613539ddb0229---63492023636.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/p17bdg8jcdv143qed1ocd7epb8/widodotibajupap.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/82677314478.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/ketugupebajusowe.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/vobevamaremi.pdfIn PDF document text
    • https://telorgabus.com/contents/files/wotidef.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/25759524604.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ialhqud1qvui5hjv9e83net0o0/12438336375.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909055911_cyx5dk.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/855db5c421851769c0acec1f11db4fe1/jixotisazaxuvigexuvuwota.pdfIn PDF document text
    • https://vitanov.rs/files/sokowafunotokolegulijek.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/68138188287.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55669889043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=omnisphere+2+gratisPDF 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_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10676 bytes
SHA-256: 3012a6d6dcdd6ac5c3c8469b61deeb53609777e3b1f6e9b5f9f71c9e98c5ceff
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 17696 bytes
SHA-256: 2cd5be5d53cd7377d668dfd2359639c6d55c3fefffeb83be28c69ca801beefa0
font_02_sfnt_off0001310b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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