Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd126565fcae6d4a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 02:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16fd27e32693bd734fc7405abb147544 SHA-1: 4f2a6bc453606cc711be7c68332941fbe7c7b4e6 SHA-256: bd126565fcae6d4a6431276b288abb8b9528695690e1977f5b5d1515eeb5a481
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=zack+snyder%27s+new+movie PDF link annotation
    • http://obchodsezlatem.cz/upload/files/kulejigonoranuna.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e8mq0nd75j4c5hsf0ib4jherbp/rijug.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/88874026456.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78449840383.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nitesisukanefulim.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/87466907944.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/malufowewajez.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/vonag.pdfIn PDF document text
    • http://ubest.ru/images/file/11051891876.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/jopukuvelozewibegazewupow.pdfIn PDF document text
    • https://clickbox.ro/images/file/nenonuzapavidepigonadiko.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/54028569022.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/36612244545.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jesexukadosogikisakubal.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/402bea9eccafe4736c9400caf9904900/vomefadarumixo.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109161755067781.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/wobaxevifedulazusitixov.pdfIn PDF document text
    • https://matratva.in/userfiles/file/fujarufofewuvuw.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/74466261764.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/wakozulanowoli.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/zesuvapugibitem.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefac1cbf4---16872965338.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/jugegevetafaxa.pdfIn 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://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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 19016 bytes
SHA-256: 4801d5c72006f818b0b6f898b985a35f57063e5e1bd1a5ae6b628a0f9d6dbf1c
font_01_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 10744 bytes
SHA-256: efc64ae5be14b69f4043a434541cc271e68ad6d57e5f404207042d7253dccab3
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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