Malicious PDF — malware analysis report

Static analysis result for SHA-256 2295709716dd0585…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 13:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a30ee32172691fd4cff6fe72d7676d96 SHA-1: 1e08f91a10f98473da2bd86d38a22804f19b733e SHA-256: 2295709716dd05856a8a0139a4afee11a8a289cd8aa9ad8a9105c8ded5877dff
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and numerous links to external PDFs. Several of these links point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a secondary payload, as indicated by the 'PDF_JS' and 'ML_NYX_PDF_MALICIOUS' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ranahytta.com/ckfinder/userfiles/files/vasusorixanubusene.pdf In PDF document text
    • http://baracenter.be/userfiles/file/xivimil.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1dd6290d---63536226012.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/40972043952.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/29518821557.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/67505527083.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/bedoxina.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7evhi7s5lgvmna4tali203n9k6/50129931477.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xawokolikufepefesajew.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fupidewuromobavisezavefow.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/50122616026.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/raxim.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6a6a4973---xijozuzital.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/43982953798.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/binipomelaxuzalazuba.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_121114_127.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/lezemuzupo.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kagizoxorosikuriw.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/jowusokalafoxilatedu.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/78083201406.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/2067620099.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef47a36e4d---ganomixababivizefiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+take+a+screenshot+with+a+phonePDF 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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 10596 bytes
SHA-256: aec5c4883683e20e7cb51e36d99c4fd8477b8c25001f491f950c52b66307de64
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 17576 bytes
SHA-256: 1144a089e5207b566ffa4334724a9ca262b88004fbccc9bf233e1ea48818937f
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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