Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f7c7960ce87b3b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 20:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f5c35f2cfd4412b54178d96ef880dbc SHA-1: 002cd63b81627aa3a715319f35e5e27910ea0001 SHA-256: 03f7c7960ce87b3b510383cc73ee4ed66bc533356120bb652599978d5b469613
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://ytovietnam.net/ckfinder/userfiles/files/49639830507.pdf In PDF document text
    • https://bititechnika.com/uploads/file/pijakitujepurisob.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/941e5ec6cd43c1feb6517e09744bae50/37358900986.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/75318062302.pdfIn PDF document text
    • https://rosycaffe.com/file/11270750733.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2cf23d5a95c0b81ef93f668fb5479bd6/34473807748.pdfIn PDF document text
    • https://artenika.pl/fck/file/69632872288.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160847cb88658d---nunuwavurebezivesiveduwuw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f242021555f---pabedut.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3740605a6b12a275a0f4ff6eca3ba854/zobinid.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/87649026056.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/vodazezuzugugulof.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/mumosasuzufeg.pdfIn PDF document text
    • https://serka.com/serka/upload/files/27476637139.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b691a54558---wutolododada.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6684v4brafvctnnduu6o3c5r8o/xuzofaxopepewewiw.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/rqj4k8e6kde0mn91mdlg6lc9q2/vajisok.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nimim.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4532bec66---kojuperux.pdfIn PDF document text
    • https://palet-school.com/files/files/zopafodifisusikedul.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/55586189657.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/duguvunefolefabin.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be305c410---zitolokemubajasowunu.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///wuragawivanumosip.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/89267288666.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/31617665921.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vafumitexubup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=curly+bob+with+cropped+bangsPDF 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 11264 bytes
SHA-256: 75c1a55e743e2963b9a44cf3756bbcc8220448215fae0d18e66714d7ef55b482
font_01_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 15976 bytes
SHA-256: 221f2d310584dc0b31c2178c642c78774e0d7dae9a8c7a8572eab6fee63bb8ea

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