Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbae46aa683f78c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 13:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a79adbddbe0cc1be25c5cee76b6d8c1f SHA-1: 345a8b1b8658fc9f187b85ed361138edfe25bfaf SHA-256: 9cbae46aa683f78c383104d0902b5000b3981bedbb7b4fdc3a23866f9115addd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=best+free+series+streaming+websites PDF link annotation
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/32uisa2h9497i04mptrou8ml51/19762088002.pdfIn PDF document text
    • http://cbstav.cz/file/tonoxubuponetakulifu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/lipaxixowuduf.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/desababexanudiluzizive.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/26902268047.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/69532408140.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/judunosog.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614372633e7d0---mexalasefileg.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/kirowazigamar.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nidakewobulisibako.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53914686106.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xanubelukazidivenideke.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bixogotuvuwigibilokov.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/daker.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/36075002316.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/worelomusavofonoxapox.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/pudatorupevifaduw.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/73136707713.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/12898579331.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3b43ba1a26b36e20348a9f54c7fb9267/kafedonuxezarin.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dorum.pdfIn PDF document text
    • http://datcat.vn/2018/file/57595758637.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11389933527.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/4227750298.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/34658632808.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64ecdb8f95a283614f29b91cbe53ac9d/pobifokazepebonaxukomu.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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 10668 bytes
SHA-256: ba49898f95d204af4ed62bd12cf507084e64a2b15c192e3d778fd07b6b2cf475
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16160 bytes
SHA-256: 2ebf05640ec91f7aba6492be5869a88c56508f9bc4c2db8251ccd8c7d1bd129e
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1