Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1b1089dca2540d…

MALICIOUS

PDF

136.1 KB Created: 2021-09-04 13:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c3f71de7769dcc4a79252aaf4619aa0 SHA-1: 96be1f1657dde88f1f2fbb189e9428e36aaa38ad SHA-256: 9c1b1089dca2540da32001bd1898ab1f104161f2e0a90d9b09f5b4baf511161f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point to an attempt to exploit user trust by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://healingtown.org/userData/board/file/rawamegawuba.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b6e433f3d---84067393136.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/61730091385.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/fepusewo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94c4ce711---finaxe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/bubareletunuri.pdfIn PDF document text
    • https://lavineriablend.it/file/mijizusuva.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/fotajaxugotifenebobarig.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202162888133055.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/63053168152.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/7eedac16a5d48a39c675b16bda03cd7a/28217355344.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/7397001704.pdfIn PDF document text
    • https://webhosting4.net/media/file/50792471651.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886e1745c---dazuzafuxefo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3442ab09---fumatikuxij.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8509643e89---widaresu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/puxesujigulu.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/12004910175.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jakenosujuxik.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gegop.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174aaa3bb---sapuvalitulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=locksley+hall+poem+pdf+downloadPDF link annotation
    • https://doi.org/10.31377In PDF document text
    • 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_off0001aa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C240 10844 bytes
SHA-256: 6994a6f0c5443bc36a87b67aed01b99a15373e95da3d1b32c830da572e00f0dd
font_02_sfnt_off0001db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB2E 21644 bytes
SHA-256: 8c49315b81e6944fa6c5e53767093f64dce6aed73f67b685e2e8fa6b9dd1d405

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