Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d732ebd8265a99…

MALICIOUS

PDF

70.7 KB Created: 2021-10-09 02:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ae60f315889363e8466c09f4a1ab741 SHA-1: 31722dba2b26a7fc0d990f2923bb62d3fc3f371b SHA-256: 47d732ebd8265a9956e00ecfefc489c33e8e9178e99ea2f03655e0ab7403813f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The URLs suggest a lure to convert PDF files, likely to trick users into downloading malicious content or providing sensitive information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 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 https://nomylo.ru/uplcv?utm_term=convert+pdf+to+word+file+to+edit PDF link annotation
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/fisagenoravuvegeze.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/02096be25d29723ab907123cffbb5090/30691663003.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gafuzakegi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f307f96d---sizegelam.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/30466629586.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8ca6c119---vubutal.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/33696101522.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/45614850516.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/nunizux.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/14988835175.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/615a50d7a8a85.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/juguxuga.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/varizetuwupo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ee8f18ca552255892037da610ad33ffd/dogofupetomazadujevu.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/xagofanesedupofezede.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/solakuxigukor.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/korojonale.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/sitixezil.pdfIn PDF document text
    • http://a-pointpro.com/cms/ckfinder/userfiles/files/bixegapubo.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/videwaloronixigene.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_off0000b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16216 bytes
SHA-256: 7a717a3d9a14f21afe9a7d418763f3b7ae57d49602ea143dcecef473e7029806
font_02_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10344 bytes
SHA-256: 78c24b0c2adde2b878ee2e855a2bdee345e0911a59b10c19b43d39c5d995b498

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