Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb39ad5e3a0f5e9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c5d6266b6762b8e9b47d0bc98d17e72 SHA-1: 921aa1bdf38a6afa17b5ca02af032d29fe18226c SHA-256: 1fb39ad5e3a0f5e9127ea86fc46a783308e2374fd9bf38837465715d39251a7c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://totounited.com/contents//files/23559639866.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd5be4a1f---52176324425.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/newuvowosamu.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/vobup.pdfIn PDF document text
    • https://iword.de/userfiles/file/44700867621.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f88c82598bdb3ef46201e3794393e952/kekitu.pdfIn PDF document text
    • https://arerp.kr/data/file///50862286493.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/29666679859.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f1c93376a585f51ded37282ea14dce3c/75153998790.pdfIn PDF document text
    • http://erdbau-rauch.at/jelewawemosasureravuzunu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/73804242627.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vogatelomojugasoniguxuka.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/86649a31e74991ed5b8b1f6ba21d17f5/57796270916.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/24487850463.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cfbe1bcfc---supak.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/39c771987bbb691661d8753a3887f0de/gujotebiloxatezipakuko.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/23114540053.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbb4bd53d---jonikuxovidegaganuvu.pdfIn PDF document text
    • http://come2menorca.com/images/file/60512789093.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/93093890680.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/lubabowizolejoxafuvuv.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dab4792e035---jujapefiwonin.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/pajubasexamogegezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=deep+love+words+for+herPDF 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_off0000cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 16864 bytes
SHA-256: 71ed36a9bf8ef7c548d22418da08ea41fc42064f7b4bcc00de120736816e8037
font_02_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 10292 bytes
SHA-256: c3c9f0e6103489a903df1b431f93734c1907c3338ec5c303c388dfdde07b25e3