Malicious PDF — malware analysis report

Static analysis result for SHA-256 487243f8b5bb2a6d…

MALICIOUS

PDF

83.9 KB Created: 2021-08-16 20:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34b771db71efc8d368a9b325acf3a30e SHA-1: 96818dc28b85d93d0c5ed2a04794167f81e245f5 SHA-256: 487243f8b5bb2a6d0b9de951b2efca75fb0de1dd51f971c5253e73181807da15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains an embedded JavaScript stream. The PDF also functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of JavaScript indicates an intent to execute code, likely to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/53c113572694405835e38bc2a47be4c7/46574131090.pdf In PDF document text
    • http://atenngo.com/admin/sites/site/documents/83654715540.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/eb4eef1fd05f71c4ba081dea5b0b6a0a/90603604407.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/735c3c6c9571fa00d1a160ab6a2a2e1f/49761298634.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/59940281903.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/85607280523.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/30053244750.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/91534626157.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/99139415055.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/xitodi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccbaa5645---vomomagusabisobu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160804c06d5a2f---femixilexatezokeg.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782b00dad63---89378700561.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dc030725bb0acd29364638dabdbb5525/filatojemuwekazugawafij.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c324fa10595---jedatudaxeginusurosomew.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dddc5d7432---46174678932.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce11b35de---nubezewutitamaka.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/zijanusofetil.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e240929b18e52ea9df61191df5f12e94/lodupopewubosire.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/gatozotediwesifipuzalavid.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kavuzineme.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/relup.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/metafura.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6af219bf1---64535931372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=%D1%80%D0%B5%D1%88%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA+%D0%BF%D0%BE+%D1%81%D0%B1%D0%BE%D1%80%D0%BD%D0%B8%D0%BA%D1%83+%D0%B7%D0%B0%D0%B4%D0%B0%D1%87+%D0%BF%D0%BE+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B5+8+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%B0%D1%80%D0%B5%D1%84%D1%8C%D0%B5%D0%B2%D0%B0PDF 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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 20384 bytes
SHA-256: 7a6d931b946327ba4f3c5313e53b971f12a39afc4b8b3377723f863d31fbb070
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 11700 bytes
SHA-256: e93392e88131a3b6b35ea149274efadbc7bb6457d0a19f0df2881ab687b7ce8e