Malicious PDF — malware analysis report

Static analysis result for SHA-256 157d6ee6e8ad96e8…

MALICIOUS

PDF

90.5 KB Created: 2021-08-02 23:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ca659f19996a009fe87f68e8410e3a6 SHA-1: 2d2abfbd811a16d8fc22acbc3af3d6a69016fb25 SHA-256: 157d6ee6e8ad96e84ecf1c5daf5650f104ec9dca846151f6965582cae6263d55
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The presence of urgency language further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609947256aef1---bizolezijoralik.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cb8c0c4c8e4b3eee22f7f0953282f2f9/xixesulowilitaxorasirole.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b9d731c1b2f71cfb8b2107f72b0c811e/91150453063.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cbb693ca0cb719f8e598ad14b9fb8c7e/fozovireg.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/18283368033.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/otktdb777qk8q94aou8priftv6/59576095504.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c62d717ff---11898504767.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kunikifoz.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/23286616381.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5moj3labh7ss8ikhakss1bg8qb/25584837120.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/12e190244c9b688bc2a1be5c8a599812/7380721563.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/18221340662.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/pibekitufunom.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gapefobizeluzerikorujejej.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc014356bb39c1b701237be629e4f2d6/xemakosadivujugo.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/vadirew.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/44802946165.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/72206007430.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5565e5df79---21880261613.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/regijo.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/42256420079.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5416d2e9---bumiroforojisotexa.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/1339450753.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0dkdcoo4m9ef7adkf2f2p4dr32/rokiravezewikemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zambian+affidavit+of+birth+form+pdfPDF 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_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10588 bytes
SHA-256: d45b31cbae4089324377bccdcf17ad82ddb9407f2f0151bba3fa91811dd5831b
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 19348 bytes
SHA-256: 14c195b894a874b9ab02e5facd2d14107d0ed95c300a2e1fd9ed155bb89d7441

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