Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe6e7dc5c56d0ba…

MALICIOUS

PDF

97.8 KB Created: 2021-07-23 18:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ba088268c64f6dee104ebe31dfc8942 SHA-1: 921dfb83f655e86018da3659c8ce3f05beb9959d SHA-256: 8fe6e7dc5c56d0ba6606609e0402ae3455179f14ab8c6e9008587330c2d097c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609153243a605---4980809934.pdf In PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/tusawesimovafefis.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/wirivewo.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/sogatowe.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jokisewadalifesamagudu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160905a3fb30ac---2139573525.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pancl6sr643pd5vn8l032j2bt7/tuparorizami.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210602190803.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f586e6af27---kunoguxugufatuzo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f2affa2130ad539e62951a509787caed/rasudefegizuxiw.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/t5pvtmee7pb3c5af0d1i0pb6a3/55203462765.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4f62dad1---jalid.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/67223591902.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/lolalizozoju.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8e412bf8---nozolalu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e27cc4a7ee1---rodumudabobuxesatazupo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d155a859a---56577724043.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/76599331044.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45a2019f3---xusezimoguxuluwup.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e619e58431012b8567a67d388feba504/gumukunafevif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=capitulo+2a+prueba+2a-1+vocabulary+recognition+answersPDF 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_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 18916 bytes
SHA-256: 515f038e7d5eb07cdacec4a73d5002f26d533b99825004bc9c02c03cb4b595f0
font_01_sfnt_off0001464c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E63 11292 bytes
SHA-256: 432f438c605a9d271abb49ae3d0870b49a30c781b6dfd3f7bbfa7afec1aa566c

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