Malicious PDF — malware analysis report

Static analysis result for SHA-256 890df299734badce…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 01:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8557fcef02ce7a31aa40ad1480dfd4c SHA-1: e427b1b6884fced917aa71fb52314a03cba1881b SHA-256: 890df299734badce6a16036bf02b222f1214237e1d6fff5b160a0ddecb7d416c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pixomot.ru/uplcv?utm_term=manuale+investitore+consapevole+pdf PDF link annotation
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/97boj2ab9hen3jr1bch0784qu8/vodadakulede.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087274490341---45239849684.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/rizutave.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964891a67a2---funafodelujifusiwovogenek.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606d903b52340---69658186336.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/9036977479.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/tevatowal.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/likexobinexixexaxupexi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ad6e03fe26c60312e67ff93a757c8642/vibupuwop.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddff1106cfa---dagokefigazotugajaja.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9397afd82f438ba7acfe54661ff27dd8/77529133661.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/68815653968.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/xefudigojupasonoluz.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/giwegibewotedujop.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/52483b093ca13bca1ebb042c7589a25c/panoxuj.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0faa5ee515811deb49c73dd413eaf4dd/28321729966.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-11/20210611231801822474.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/dopapikejidojug.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/relimatasololopi.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb09a8de6a3---relese.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/29795852652.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c51d1d2ee6---11735045743.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/29684235396.pdfIn PDF document text
    • http://abpaluso.com/upload/file/86700832073.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kizivujukupezavabiseg.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/popavemorala.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_off0000baf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 10772 bytes
SHA-256: fb34d13accb80864db8328974c3cb3456c2b9fabaf244b83e1fd227a4cf26861
font_02_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 14692 bytes
SHA-256: bba04a7522cfc594fba9f74c3cfd963169fb63b07e45ccee616efaa42a3a1d91

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