Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55504fa1e4dcacb…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 10:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad6a905975a4b5d8ecfca98b92ac5f4f SHA-1: 15e0d97f5ab0d406d90878f0f87e4fe09447c431 SHA-256: c55504fa1e4dcacb5cc14fe16c71718f0813f4f58157bc3b3e6c5dc2505177d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf4ad6cb18a413a02ee7fd6566cc86cb/1311153650.pdf In PDF document text
    • http://pgnsualumni.com/clients/872691/File/69506590130.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/27953631421.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2950f7c1---lobirumukeluravoko.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/72009098217.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/80b78544c9b749e385ecb70bc94d56db/moveniw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0c9bd821---bowokojudameda.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/vekepimopanofusuze.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/5589891388.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/54555593724.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xixabuwa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f317d960---98381937946.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd76514b289---92058887672.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a93ba4bf0.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81f20a5e1---betusinimuwujib.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77d1c60e8c5e62e2687a60a8af3d7454/norisiwituk.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fanalutolupuluses.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106dfa870ed6---sozumo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///21000421351.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf4820502---14975549829.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/96ff0eb27f88697f33aa0f2778ddd96a/31290962774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=allu+arjun+new+movie+surya+the+soldier+hindiPDF 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_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10992 bytes
SHA-256: 736646637a4eb92d9bb46d3721fdc6aea0088e76e66af450d3a9ccef4c7e365f
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 17304 bytes
SHA-256: 38bcec65c7f9201d69e3893b9f2c546bb69899010c98ee6031240beefea9748d
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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