Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bec327b5afcf8e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 04:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: facd01988846ce166d825514e2a3bce4 SHA-1: 59b081bdf1d68955dd744a4d114f28f8881fcb08 SHA-256: 85bec327b5afcf8ea6eef74d8fcc79bf7e58e4dfd65693f099b9dfd0201dc05c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links suggests an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mwflower.com/upimagesfile///mivelug.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd9505c50---26409576255.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nokukidotiwesapesewed.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109071234417615.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090220301559.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/xozelisodari.pdfIn PDF document text
    • http://juncheng.tw/upload/files/bidilibopulovigutirevubu.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/66654842664.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/67024290493.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/72922294019.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/99377201347.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nejisunazexeridozosiva.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zonumozuferulinikenitava.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143afea14d34---riwufibelotuvepi.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/27348202846.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/48357489593.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/zemulate.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffccadab1a---mituxo.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210907131518.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161371abef20f2---lilunitekekutukegexok.pdfIn PDF document text
    • http://seamacros.com/upload/file/xeten.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/82352766416.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bisurubinetazezijoxuzivi.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/64527645369.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/26943487150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+infinite+world+isoPDF 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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 17084 bytes
SHA-256: 9f18e9f991df9b55e3cef92e5a86071f61be416243b871824a764cebff9724dc
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 10816 bytes
SHA-256: af9010dcbc164a6ac082716d3dc4c698d3b13b921612539464fea80d77c71916

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