Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbce2fb422abd8ee…

MALICIOUS

PDF

88.4 KB Created: 2021-09-14 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3838530acab6d1bd43d229f029ef2d27 SHA-1: fdc77a20973da6247e6bd95226c64c847e0efd1c SHA-256: bbce2fb422abd8eef013e96160c224c84102608e25b2507512514a26fb8e0591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://castel.lu/userfiles/files/mixavejolelowo.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161394b3c07420---jetumezozuv.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xamunuwimekenukiguted.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/joragijizepujitixogab.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/xigojewexezolusuduzewiju.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64e3bab61---kazurubofozejuxen.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a3e0f7e3.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/19694950509.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/204373ac06696fe3a93af459d0a36e85/lizejuwopezawomuf.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/50883735251.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/49626534751.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/81559307358.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/bolaja.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/98451983749.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202193256245126.pdfIn PDF document text
    • http://scsychem.com/upload/files/93955201849.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/12654476796.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nutuf.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wozeforerowe.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/vojolak.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/93360344994.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfe61508f---84798432585.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wuleruto.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/50175167710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=indian+idol+2+judgesPDF 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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10524 bytes
SHA-256: 19c88ed2a972ca0bbab5fae48352debe1112b96e045d524718b277fc713491b2
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 19940 bytes
SHA-256: 0f1e63eacbe29d0468175986f62751ea4b85abaffc20cb2614c13c4095ea3193