Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f01aed17365501…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 435d8669522adf0327031b59823c0b6c SHA-1: 60b6faeeaff9bdfe717e78921bd2c9317542ccdb SHA-256: 11f01aed17365501cd7caf39f25c7f877d76a8c0f7d2f46a94c1479fe7d46771
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting the potential for further malicious actions like redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=pubg+mobile+apk+and+obb+latest+version+download PDF link annotation
    • http://zaiger.ru/img/file/xotezulobuxosim.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/datapipaseted.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/minine.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/kewuwonapisinedow.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/26257132986.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lcp1f4pf37vkt4vj6r7ptq6bsb/kuxobepegasupanapiwilo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9cb91530---wemixotugadiw.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/65249882078.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/webot.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/bezap.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zugusaxutim.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78008024706.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zikonuk.pdfIn PDF document text
    • http://jawarakreasi.com/file/katebogopediwokutaroxekes.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/xabotev.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/6890417291.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/14878591960.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/jidem.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a89bb92a1---51279286756.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/fovixurapuxuteki.pdfIn PDF document text
    • http://keyday.ru/files/files/dowoxuxezapuzogelefawak.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/17072710262.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/41200677492.pdfIn PDF document text
    • https://artenika.pl/fck/file/gakuzupafazoxevuzodig.pdfIn PDF document text
    • https://emmaushuis.org/pages/23622103411.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/92253269073.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_off0000b8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CF 16440 bytes
SHA-256: 8d38f96a8e45def3b67cb8f880b3f337cf877990b07e5733696bcc0d2423caf0
font_01_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 11220 bytes
SHA-256: 73291fa1b3ca9256e5fc46b2b9707b14b2e4c391e8069ef6b6977e3d78692768

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