Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2478f539bb60b81…

MALICIOUS

PDF

83.6 KB Created: 2021-08-14 15:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 60829cb81e1b044a0445412d38af59c5 SHA-1: 095aee39782ab04afc0de3ae5226f7da4efd0571 SHA-256: d2478f539bb60b81775ec23e21d516d6d3945c2ff04d5898cf011f6fc29d6e6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://thanuyentea.com/ckfinder/userfiles/files/93652109267.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/20193116785.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gakadetazexumegi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/75477091213.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3botli5bmms5mmlh42sro7s7jj/bexarinilinafij.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/30358146710.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210702062312189.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/75592813205.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/20063176147.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6e6c3c36---noxomufodo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/94405726780.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40f7f3048---puzewolewinedogu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/mitom.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/39295472076.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/senevitusarifokaw.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061818274865.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160942b08a73ba---zojilegogimalufutosasow.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/puxofemofaxigekipulonag.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030736001141.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gurubilofux.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8bd5d87e---99656968745.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b06d2b92f---vigege.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/sipatizo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/serowekidanevupisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cuantos+atp+se+producen+en+la+respiracion+celular+anaerobiaPDF 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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 18192 bytes
SHA-256: 6c65139d42d339726e04588c6d0b2d11ca810250232a928847f9cd38d5fdd9af
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10776 bytes
SHA-256: 033dfa1f52b0c6af0b2b025d2f45972fa88d95f5b5e7877c683d4f1b454f00ba
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1