Malicious PDF — malware analysis report

Static analysis result for SHA-256 80761da38307bb61…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 09:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 112128c045bf29e4ae1cc11957d921c3 SHA-1: 5954220e71b130be68d3a0de9915a77d9b684b3d SHA-256: 80761da38307bb61eb60da66ff54dbfa9107f9abc62aa312c692cca3f5332ff5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with several identified as compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accuratesearch.com/userfiles/file/fomezi.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/xagebeforanawo.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/69600027124.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/13588815704.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/53a13b06de0191ce9b40f7f84351d05a/14210814297.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/24229963335.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160889baa28e22---lakotusanib.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/78379534082.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/ronugosomakeduju.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082deb778726---lojipuzafejuxu.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/wutivogudakubevowafevif.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/likipegulonokalitekunuf.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210624_7E7F4E46220F2F0B.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e187e979---wamoganixomu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cd4abfce---20872119015.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/somalekujulizigakuwu.pdfIn PDF document text
    • https://heyratacademy.ir/file/87916979949.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/xijisakisezewulupumedoru.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/paruno.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee3d737ac---pudubukegi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/59996911984.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3e715497f---gozoruvinenomiranivoza.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/43474499531.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2383e106---wijilut.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071932409c87---pobikusejofezulefoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cohesive+devices+worksheet+year+6PDF 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_off0000c22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 16356 bytes
SHA-256: ec412594c86b5adbeed123637ca395cdcfbbc1ffed4863f65f85cfd32069893f
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 10876 bytes
SHA-256: 0bc218804b168ceac663db9c254b816bdc4f16755f315757c0f4170d97a51042
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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