Malicious PDF — malware analysis report

Static analysis result for SHA-256 4717400deb76b325…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 04:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8403cb3454678b593e1f7cfb76206d5f SHA-1: f375edda92989543b64c399c9b021440358d2f98 SHA-256: 4717400deb76b325be5c00c10b2a08700b56b464fd34de228f3790800a1e88be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://valenciamaids.com/userfiles/files/tozaz.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/95016055259.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/13777338408.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///dogofatuja.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/50924302583.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/38649752256.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5098705ab129c0903a841176a7203d92/miforiwaxezelibibajiwizis.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/40858704968.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632777275goledidujopasetesavaw.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/13922321958.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wujefajozobusokegebibar.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/mobewuri.pdfIn PDF document text
    • http://shesob.com/file/files/74187475414.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/mesubaximamazoj.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jobalerivusadobera.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ea2eafc4---44230706959.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lunerogavafobeg.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614538a37e2f8---11102464239.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/57660927772.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/nidazexu.pdfIn PDF document text
    • https://tivicom.vn/upload/files/38913607361.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/memevirakaxobugem.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vusari.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/55217753348.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dimupubadudusamurir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=emergency+weather+alerts+androidPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 11000 bytes
SHA-256: 0d02b4cdc6ccf1d36d77aba5b8a2a6b1bcd5744b20a58411e27a49175b5a053e
font_02_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 16804 bytes
SHA-256: 8b4550b563205c610d8879dc791133d8f0493606d8b0933a723558a12b2e6ad5

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