Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d2258e21eac1cc…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc437771b2fdabc481d5a4d88e9f8065 SHA-1: b866af62957cc09f6816f6295b7b4d8a27600091 SHA-256: 89d2258e21eac1cc7821f7b71b1a914252e44d8a6492bcd5cc88afd5c5ab9cd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://coretry.ru/uplcv?utm_term=zelda+breath+of+the+wild+pc+emulator
    • http://sichera.eu/userfiles/files/93129445856.pdf
    • http://svaz-podnikani.cz/files/file/jonasekixukud.pdf
    • https://gonguyenkhoi.vn/upload/files/69481987810.pdf
    • https://lrsinc.co/userfiles/file/kevejubavimixivinatu.pdf
    • http://195exim.com/datas/files/29832944742.pdf
    • http://ukwoodrecycling.com/userfiles/files/60021943541.pdf
    • http://www.cavice.fi/tiedostot/files/dopezejifit.pdf
    • http://nemdanangpho.com/uploads/2021-09-03/images/files/fexalagesupo.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c061d190c85e704b85711b8fcd85479/xigozowuxudumepa.pdf
    • http://sunway.me/uploads/file/181415215460.pdf
    • http://daieimotors.com/js/upload/files/84057385723.pdf
    • http://hakanhurdacilik.com/userfiles/file/xizemugak.pdf
    • http://mariamozharova.ru/uploads/files/75929748928.pdf
    • http://ciatic.saintelserver.com/archivos_editor/file/nuzoze.pdf
    • http://limeitec.com/upfiles/editor/files/66827010090.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/45540943040.pdf
    • https://hiperaktivite.info/userfiles/files/dezuwokow.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/lebirorali.pdf
    • http://tradotel-riviera.com/file/53258691590.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/lezudogevokasi.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144f52461545---25599136301.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o9v9ut7qhbm4h5mnej4ddeee5f/zivuxajegaguda.pdf
    • https://hasekei.jp/userfiles/file/14282893780.pdf
    • http://immobilieninvestors.de/userfiles/file/suvebusavil.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/34377259020.pdf
    • http://koppeika.ru/userfiles/file/pofipufuninipifozixo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 16792 bytes
font_01_sfnt_off0000cd0f.bin
f81c1d8774edd4411d07cce46d8ce16914a4947aafd0ce193d673be07eb97cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 14828 bytes
font_02_sfnt_off0000f20a.bin
a3745406bf7b0f0060c8b17c9f3ed3e682d3f1b77b1330278cb15e14c2c85b29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 10900 bytes