Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0557d053ad59835…

MALICIOUS

PDF

74.4 KB Created: 2021-09-08 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f947630a61fcebc0ae413c31d95d1a99 SHA-1: 060212b91d708beaf3c661406612591b7ee7a826 SHA-256: d0557d053ad5983548f83d28552c296c9a9e8ed9838804ef13ce91a58408128d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://doubler-son-capital.com/photos/files/bodesawopa.pdf In PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/gefojusejosonobinub.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/25700952073.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/18694576081.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138605d8c613---30722650016.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/widet.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xikuwi.pdfIn PDF document text
    • https://fivetc.net/uploads/files/70982465653.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mopomufarugowafozuwutuwiw.pdfIn PDF document text
    • https://funke.be/data/file/79264662228.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137318477d2e---51821227974.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31640614469.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/79933990874.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/39705890043.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613059c1c20b5---nanituvigewusone.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/33271690902.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/10826212757.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/gimidigibude.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/28786496258.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/mibulisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bewafa+sanam+webmusicPDF 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_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 18676 bytes
SHA-256: 3a368eae9ca4180f30688daa549b37200574e2ee5ed81c9dcc53127a5f1093ec
font_01_sfnt_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10512 bytes
SHA-256: 6471e5df8c4137db18103b86421c6ebbbe777a87c961d32141f231d958d3b189
font_02_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1