Malicious PDF — malware analysis report

Static analysis result for SHA-256 c970012dea13a79e…

MALICIOUS

PDF

116.1 KB Created: 2021-07-28 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 682b82280e6a3e3bf1b69a2f3d5ae4de SHA-1: b7418164abb50d0369f937a296c5510ad2a225f9 SHA-256: c970012dea13a79e0f1e66832c789c9dd1b483b315e542472c2811a6a0c70704
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, specifically within form upload directories. These links host other PDF files, suggesting a multi-stage attack where this initial PDF acts as a lure. The ML classifier strongly indicates maliciousness, and the structure points towards a link farm designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d95dfba690c---nusoxiko.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/26263097275.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/42127494444.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jerupeluvilugaripeto.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/80semdingeoce8b5r1ikhpv58d/janabemidub.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0579ee45---57228780905.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26ae2d5cf5---vavawoxel.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/38003490740.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a6a2a34---lutefelunepaniboku.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b869f0968---wafibez.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607490b824c3e---rigisun.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0df1289bacbcf6758408962713718820/19570471336.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/najewivezaxaworu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df353314ba6---51458747183.pdfIn PDF document text
    • http://slsnn.ru/content/file/bejeginotozi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e76f23dc8---vutewapasivekalevepikaroz.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/vopapik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9utt68rehph6vt7o8hjfmfbem6/bupuronujezonusobuguzawu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c5815t73arcoje71aq4p0s7ov3/39491274655.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610235753353.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097bd578528d---fexakexezimumujilu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/dafozaxatetesidi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb33391398---nakidafukexadaw.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6ddeea04cf3cb4a39cf949d9c3d8c5b7/96355618681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=summary+of+little+red+riding+hood+storyPDF 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_off00015f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6A 19028 bytes
SHA-256: ac8821203e1dd8ec2b7e32d962feb957e31202577caad97f53f698a478b63bd3
font_01_sfnt_off00019006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A81D 11088 bytes
SHA-256: 274b6eb2e5bc3d941a8b2ef5918a3261ccf90758f8b5ed7019c47f9b5329733e

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