Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53ec1858a5335f1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 17:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4fba6dd1e692cb3a8cb2a7cee6788ed SHA-1: ec8eeeec9c835d5bee3060b27ffec69f768981eb SHA-256: c53ec1858a5335f1c7f6e5e057dee2eece49e27c93942a32f549cd83e4b541e5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://phutungquanghieu.com/app/webroot/files/ckfinder/files/sirit.pdf In PDF document text
    • http://sicilalluminio.it/userfiles/files/89757301782.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e0a4714d---594396516.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mutakumibosuleguxari.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/23811751704.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ruludunuz.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nasanosi.pdfIn PDF document text
    • https://mcsfood.com/images/file/79329527759.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/32304578056.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wagegetoxovuwok.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631285808.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/lonawawifumowudiwot.pdfIn PDF document text
    • https://sambelteri.com/contents/files/walaxefozasewir.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3d607f97---35660767956.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/diladarudakon.pdfIn PDF document text
    • http://xycrusher.com/d/files/80453560438.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vjoue8kmo0jr62e241qqoo9rne/33788049202.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12408338593.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0tnan02lf7d11gg07tago2fef3/rukolimenaku.pdfIn PDF document text
    • http://ipublicity.cz/data/file/puxidarenufutebilus.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/juranipujowizudelogupigot.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/54572644358.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xizovigig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+unlock+phone+that+has+passwordPDF link annotation
    • https://easyown.ddproperty.com/datas/files/54588438443.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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 10788 bytes
SHA-256: 263e2254e6405aebe0b3264b6140b843c3025a00110b01be3670c8276c897098
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 18088 bytes
SHA-256: 5acd7a1319b1cd1ace2c9925005bc027e10ff0a94443975fa27dca8dab264706
font_02_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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