Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d52de5ee254c882…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 08:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 483ffff2063231dde1879ae47cc8fee6 SHA-1: 679021d0fedc7f6de17a111fdfdd9a6c2fb8c39c SHA-256: 3d52de5ee254c88261f4ac65913768c046a53174d2296c54b56b5a7f2b3c9166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and numerous external links suggest an attempt to lure users to malicious sites, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ferrogep99.hu/static/media/file/zufusix.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa4963da7a---pijadagipera.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f50e2e9a7---wivirudejebobegupojenuloj.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1fa60b83---zixazekuwufewe.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/83227952801.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ea9160cad2e3957d4af36159b7c1c4f3/xunurazafilonepuranesi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/43650473658.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45359853222.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pid6cctge1k1m0bacj1ggt489s/lujezivozopog.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5h713k2bmjlhef3s6ksmqaoqpv/liwesenivopoxuvowamub.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a085806f33f---pajebizodugabokoliko.pdfIn PDF document text
    • http://ktcz.eu/files/files/36972519546.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9184099deb81fc46c60a4d9ba81ab5e1/wipenapijuvexi.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/43033656098.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gekupuzusulawasuw.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/goxukiz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6abbd0760---2043072331.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/17217340577.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/bd1901b0cf1a58f9b5b2eb827c35c200/mirelad.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1393316f7---zemokuviwumomoditejifoza.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072395b6210c---44176818843.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4cb8642872f18b0417a82348ea02fb7a/61594355348.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada16e4485c---jejozunabur.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa1243523b---31078955305.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8lvkvlic98po74ejamht89k5l0/tinukaxinuxejux.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0473cb493---zuxeres.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+theme+statementPDF 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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 17332 bytes
SHA-256: 02783d18ccedd913e4cfef69ce0967df7687b8a04f25d39a835ffa45dad8845f
font_01_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 10404 bytes
SHA-256: 5f7da094cd89d105f3e44b3b013a8c7ed1c8673b93c47b52ddfb434e538b4267

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