Malicious PDF — malware analysis report

Static analysis result for SHA-256 48149ad663aef709…

MALICIOUS

PDF

75.1 KB Created: 2021-06-02 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 772cc2a8baff21799330edc9dbee698b SHA-1: f73ceabca6af387f7c5f67c838583d729614a779 SHA-256: 48149ad663aef7092c6f6b26ed0b86a94595544688afe29ff4ce4f82257600bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites using the 'super-forms' plugin, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://chcial.ru/uplcv?utm_term=how+to+read+schumacher+battery+charger+meter PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/118ad326d986ea441a1756ffc7bb7ac7/71103431281.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1bb3492174579c938bd457a0ba492860/diribajiniwotitisidawetu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/41343763833.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bqfvo27omh4mug1j6g88l8smv1/vuxoxuvezudinexog.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sagivujulubuno.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37176052799.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a725771449f---86707530713.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773adbda63a---bipiw.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f53c022f06b82f1dd2a0fa85b3774bb/39783838031.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/63e2e0cf0a06a298e7feec562a823707/sovozaviririni.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9t7pqlcgttp427e7i809sht637/74132149335.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/92b9c6cb2303365e9d3ab5b0fc20b983/42624656220.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0fc9106d4318c2772613235f6c722b56/88243298253.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o9u1275f8n1fuomm2q6tm3sudm/rikogegelanepo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0baa4769b386146def86028137d4eecc/guwifewogunevokade.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b9f1ce78---26335246102.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/38694f122f51844ade9e023a23e6bfa0/werajemimel.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f8005b6fa618adf78c038c48a98e815a/46566624148.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/97d2904995839ffbb4613aa191d44c60/rumitoverorinoperola.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4b847a397570a04f48b39b76ae71f319/2056320823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 5344 bytes
SHA-256: 31b67d7fb02399a67354f4af56872baee217748ec5379a781eee2f6fe707f772
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 12480 bytes
SHA-256: 0bc588758971e4f3d1ce1953735a25e2122f7834f271737718054cb272eb690f
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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