Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccbf96e6de12691…

MALICIOUS

PDF

75.9 KB Created: 2021-04-27 22:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3f9f1a66113e34573afe8c5dd496dd SHA-1: d995a607a58fb0703a6371891669c5507368b68c SHA-256: 7ccbf96e6de1269152adfc610b13b506f0f061751b240135dc15ef8d6b2892fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3fcca94668b55d1c0bebf424974db36f/78227344255.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43461530b---6405573652.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074727ebe3b0---jazinewazixa.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160884b4f07394---67756260267.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcefcd09a---46993449278.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/76ba31e1db7dab5be54f41ffeed2a0e8/86611727594.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d481f06c21---bexugakugixada.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3cc65d28aec722fd4d2c35ab48bab8a9/73883780928.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f020065bc8---tulezelosunakodawijukaduz.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec734ea8---15906438507.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/3i6d9bpee33p62d101gf1nihjq/30930071030.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21f626a35---rizikezulafo.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/0c0b88976f6a25c254774692eeea6ef9/25751308401.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0aejv8bgkbfa4r71qicc6n7uut/buguvedumovo.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/296a5b8e95ca7d31bea4b2a572d07345/dapidupelebubojetuvenej.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cda7097ad77973cf6c3c593f20938e9/welum.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2hv10nvbnk8sts0luer2num92/kowirafuzufuva.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160740aa4d461f---tutuvaromuxumoletepesi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d6f7977ef514fabcfb2b0cbed2b8709/fagodujegaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fraction+subtraction+worksheet+generator
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin
f75eecee3da1560abedc602d1456105dcd0d62d45b98e66cdaa900a3e11c35a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5280 bytes
font_01_sfnt_off0000fedc.bin
a97a75cbe34b0386c719cc20644668a959be655e1a296fec69d5f9781283d610
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 10320 bytes