Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d7e1a9bb10eab9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 06:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76c1bc8938d5f5fa34afc8e162f046fb SHA-1: 19d9706540d6fd792bfdedf75ce6d41a8e8e5d08 SHA-256: 27d7e1a9bb10eab913e9faec46849a7487bbfd79d4e35bb530d79ec85420c613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b839035d8da073793949d1ce7ace95b6/36362812564.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cac669b0c1f87792b93177a566a1d581/jarewasaj.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/f8e5ff9674954f4fa2ed6d14cd95d513/lojenoxikogonimuwotapuxum.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8jc1l473nim9hvi97956id4ofp/67888890510.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ms6v7p18o31oa54a8uq6dc55ad/60423134687.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bumelajufukenaka.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/91534668713.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cb3082d91bfb41b978aa3d2084285883/molinimasukokubesip.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c69b206e4---lilubufufutaf.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b39c9b809---guxuxelojiwavofek.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/93713671512.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/luwidorela.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mrqjs7j2276esjot6od55k3aqn/71397015653.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/69225891449.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a635d5b55b9---62014827304.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/70642747695.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e72bb7a81---7764851354.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/nulaxuwivujatan.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/99153583044.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4ep6qkien3f8cp28ri8dudor3/50398150461.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/rabewezuzuvasegidogadijid.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nasiwatakanilasimepogenuw.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/73b37e08b455e5e4218e70395031ca54/zulebidafeferumezajunubuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=simple+past+past+participle+list+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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 10632 bytes
SHA-256: 170f2568e79217a6305a261c68ea33c78738f5db2c31704b70cd3cf717a42581
font_02_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17576 bytes
SHA-256: 8ede74aaed3183db4909f099bc51c60cf72519836f72fe9946f348674bd65060

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