Malicious PDF — malware analysis report

Static analysis result for SHA-256 26755c4bcc5047e5…

MALICIOUS

PDF

157.3 KB Created: 2021-09-02 18:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d052f5ecac2404a0efc0659d2102b84a SHA-1: 9abde6c264a6f33ea255ea6dd3a32aeef00fe23a SHA-256: 26755c4bcc5047e58449bfec27c0a313c1f2cda5af0c849bb44f4811d59505cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://nguyenphat.com/public/default/ckeditor/files/xedazekeb.pdf In PDF document text
    • http://esipro.fr/userfiles/file/pofalefimoxowarutaze.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/95612876144.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/15539137460.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e6e3687d---saxezukuveximifiwi.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/pesivetumomenukijuxomu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a305b2df268---53208036418.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/69110804499.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/66551675319.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/55207102027.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/05fe6240e428e7708e241f3b2aa5c71d/16263219842.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/vatejagilijinorewotejewar.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tawegiguropoka.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/73736360256.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cefa6b9ecd7---tamoviba.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160858dd886e30---bobekebejop.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/mabuzidu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a328c9a4---memifabudofatewekawe.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xoruregeva.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6a48b5b4c993481c1da25ab755fc3691/52560217488.pdfIn PDF document text
    • http://aimic.com/userfiles/file/98868786973.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/50c0f67eba2f7392c3b3751267f481b3/vonepotuxaritijajujotog.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/gozosurebugowana.pdfIn PDF document text
    • https://izr.fr/files/26257119095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=timex+expedition+analog+digital+manualPDF 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_off0001f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F516 26188 bytes
SHA-256: b09b93b3cb2bcf431065f89386df2f64c177086a369f7732ca3a6c8ecc460c4f
font_01_sfnt_off0002367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2367C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E93 10632 bytes
SHA-256: 3ef81c9d66d5b73142e00ef8ff78f5bccacfd1ca8d2d64d358554176783616b7