Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a97757a85911ccd…

MALICIOUS

PDF

83.0 KB Created: 2021-10-20 09:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 400bdc9d4d3caec90aa608fd779f2a6e SHA-1: c4ea5d0c16826f7fc20b41cf0ccd4d352a872a37 SHA-256: 2a97757a85911ccd518afbf4abddb22e6eb0838ac7a3aca5447a494f9132775c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=how+to+train+for+a+50+mile+run PDF link annotation
    • https://soportedevida.mx/ckfinder/userfiles/files/24642122357.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/subosiwuselikosofi.pdfIn PDF document text
    • https://sainaudit.mn/File/zewapuzivolomagetogesulu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/vodurumemetitopometiguwe.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/56572934415.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21402402547.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616d996a2aae8---90464654436.pdfIn PDF document text
    • http://land89.com/ckupload/files/79747868023.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/87213983398.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/63105531320.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/riburera.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/tupipirujizufenotusu.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/gujutezezowufarej.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/noxugabatibukokelo.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/62305936134.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mdo8fhap6l51tcv38ss3d484hp/8017089910.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/58818807427.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/juwogagu.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20211013075606.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615602c0d1ee6---wawepiratatorebonazo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/47564001971.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/zomejabatiset.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kinenunoferu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/7789765650.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB03 10640 bytes
SHA-256: 731651fa70435003c1149caaa9662d75e5889b05a5416c54aa8890eaf1d25c44
font_02_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 16776 bytes
SHA-256: 4c9d98e35d23bff63104d2e864f4b5ae53fba65bb9063da544d111c1f42b9eda

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