Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33061d0c5fea0ee…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d71c2581171c58e98ca7a201fb6c756 SHA-1: 920e6aab0c6d5e7483b0d35c5f65f9b8ea783a8b SHA-256: e33061d0c5fea0eefe7b388367ce1012b0438beb2b9af7708ccb33b29e79d4f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pixomot.ru/uplcv?utm_term=beko+washing+machine+user+manual+pdf PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082611b60278---fewisokipoxonar.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/pabefabikenedini.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b72e044b44c52b422f795983cffa1220/susino.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q4vf70n6ene2jsj3jbbvmvbo1m/38808254199.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1msluc1v73l0o13gqs3gc8caj2/45338222577.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e00d27d82d---wivaxawapip.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/lesetexufepopifex.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kadugutogadopezotokarep.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fac621c39cca3d7f907d2343717d6a07/64545681719.pdfIn PDF document text
    • https://ismart99.net/upload/files/82199487309.pdfIn PDF document text
    • http://insei.eu/userfiles/files/34122412510.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/17569573632.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/92925116632.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3ln2fe5u5neluctvtfdks5ncr4/76377871415.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/28085367899.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132885d637---japajubajunapuruwilusirup.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/vevijadupabesila.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/rakibofoveroreg.pdfIn PDF document text
    • https://kartplast.com/resimler/files/1076166694.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef1a59873---vuxuwolerunefexurutevo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76548e441---16175121296.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c03fdfe3a93307a91bd2110e88243064/23345444238.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/savilufuto.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/peludofawuvukulema.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wuwegalometu.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zepiw.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 18656 bytes
SHA-256: b778ddb33f41abbb871208c2b5f1ba7e6c2472f4f8e0510f9f6cbee0720deba5
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 11300 bytes
SHA-256: 641024301d4fe77bcbb33a3ed8b4622f52c1ec7026a729f5ceaaeb9eec73b574
font_02_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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