Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abecae6d17bcb85…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 20:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17b3f31945120106a3982767a431ce34 SHA-1: 2d5c20b90524b6d4a86b702c4bfd49e179ef393a SHA-256: 8abecae6d17bcb85cf2f487ba8d42594602df9dc1726166885336a43d290b0ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, 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 primary attack pattern observed is the use of a PDF as a lure to click on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ocw.tw/uploads/files/65746174139.pdf In PDF document text
    • http://bluebossa.pl/files/file/44159178933.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/39432457114.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/67718626373.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20eccea3b---lubumupuxogifototaderoz.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/33142270229.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b128097---29339394799.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15065694852.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/40545154458.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/47767777319.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/pejipemobilide.pdfIn PDF document text
    • http://e-hematologica.com/users/file/18233161275.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98719293427.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xuvudukak.pdfIn PDF document text
    • http://skncn.com/u/files/86889453912.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jovozogomun.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/66914730437.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/84131145626.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/88289611840.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/bodipanefaxuwime.pdfIn PDF document text
    • https://maviet.vn/upload/files/35016465516.pdfIn PDF document text
    • http://budropol.de/Upload/file/mupadijutuxanoziwobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=power+rangers+legacy+moviePDF 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_off0000c4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 17148 bytes
SHA-256: 62af3b0ae34f18b66b1c3c730dbba0d1c8bb7061e2afe5aeaf5ee4544bf7d422
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10740 bytes
SHA-256: 9d7ef43d4ccc0057a0d539d222469b906093c28fe3f8127b2117416a2ee598af