Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacf4fd882d8126d…

MALICIOUS

PDF

91.1 KB Created: 2021-08-30 11:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fdc2a91ab0b1016ad764404226460c83 SHA-1: 3005b2aa7cbb45040f48186f8abc2ffc160efed3 SHA-256: bacf4fd882d8126d196894fb200dc5430db90e18d39eeefff82d388168c7e792
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://melz-feu.ru/upload/kawisorikajubi.pdf In PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/d44df097b2a4353a2e16b6a494cb17ff/80585546857.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/rubediwadokekemekuxop.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s0sdo6lin20rjusbigkb95htd0/kenixavepogebodorupawi.pdfIn PDF document text
    • http://checopharma.com/upload/files/8979093208.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivtk5v1pl8n602kjd5404k8vc0/sazulajazemepik.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/33866401672.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sifeweputopebilasapan.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/ritenolexonuxebizo.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/menigutokujanalekoze.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cb8b422f44ab4b0d03f7e0a463aebfeb/fiwid.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/12056276873.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/riraludufebolan.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/81300522691.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160819ddf730c1---bigexexisa.pdfIn PDF document text
    • http://ridendo.cz/files/file/96689145126.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dinupodibidemusupevi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/xenedu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a0b25a14b345fa3682af66cd93fbb124/juzit.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/j15krkd97flt4l2n806bcsvre6/64129372294.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/sopigivotoj.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199069842221.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mer0i00d4i8mkakra9sd174vh5/71132788129.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sikirurubagegilopamut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=5+wishes+form+pdfPDF 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_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 19176 bytes
SHA-256: 320d6b398f391c2a809245fc97b6f55d72d81bb1ee8a49de975423800567177d
font_02_sfnt_off000146cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CF 10476 bytes
SHA-256: 1623ed2e3548fb11e9d7988435862198cf8ca0f2075134762b0d7f2bac292ff8