Malicious PDF — malware analysis report

Static analysis result for SHA-256 696dbc2c1096ef2e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 12:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a4ff4ac7eeb3f575872b3d1e97450ad SHA-1: c602d46ba263a36fa8110f6259fb7dcb10311d81 SHA-256: 696dbc2c1096ef2e91075ff980793a5a2a3e8cfb388173ea52788200652069ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable hosting, suggesting an attempt to obscure the true malicious destination. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://aqbnb.com/uploadfile/file/30223436861.pdf In PDF document text
    • http://gewald.ru/content/Files/65282929634.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/61896895478.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/81512201009.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/39046956077.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/64932916802.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/midafuwida.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/46230745940.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/85862554440.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd65e5ae4---65083827689.pdfIn PDF document text
    • http://vodnik48.ru/content/file/31859228647.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/16814010471.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109050806111047.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/napoxifubomokoturo.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/98763314654.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d742c04c7---7627864196.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/funid.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/3648426442.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c0b7c0e2330c663b79df00904b529fe7/71179935956.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lugozapezamekawiwupaguvo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/xasikifemumuru.pdfIn PDF document text
    • http://emannsltd.com/userfiles/xitasafinuk.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/visepefefabiru.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81615846541.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/sewavelotif.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60570842989.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/dinulabasigubamuwasipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bluetooth+jammer+app+androidPDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10772 bytes
SHA-256: 1e1584968fecf34832905c88a961dc84f595ca20a73c0b0872e1022e38b2d94c
font_02_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 17416 bytes
SHA-256: 2b6fedd91e8280320ae852b91311ab62321c7d41094483879fd8432d2ca03e7d

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