Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c88b407f38996a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 17:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d22a4640e34461ef29588d1a59ccdff9 SHA-1: d3a18c9b149296e3d0b727314a523c228d4bb02f SHA-256: 82c88b407f38996a018dfb164573bf11fe7f50f11e7ed4f92247c0ca22e2e277
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution lure. The primary attack pattern involves embedding JavaScript to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=demon+slayer+vol+8+pdf+free+download PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d5fc32a10df69c43075e160a28cf6402/87075050460.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/mujukegidevanugibodigufi.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/99235366465.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/melirusimaleganum.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219201238389665.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/52369528674.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/34689364361.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/83ar9u4m7vu0hc6utk8dc4qj2v/wokebusuxujodumato.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/78342510523.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12086127698.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/9893827486150f825d8b01.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109181414499039.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/50610325342.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/xozopetibuxaguseg.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/vitisidaraz.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/loramizoxowotedesapaje.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/3017335036.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/2782731177.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/kadebumow.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zenoratiwejirapodosi.pdfIn PDF document text
    • http://signauction.net/userfiles/file/71891286831.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c011ae60---ragunola.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/xatudanitasunufagoluve.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/sefutisikepulebu.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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 15332 bytes
SHA-256: c93b5922adbaab0204e308fcefa790e7be01743cfba3cfedd4e0cef0c7dc2240
font_02_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 10944 bytes
SHA-256: 83cf223df37d321af44d02447630ac9dea2c1e3242d2e89832ee3bbe9c56e21a

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