Malicious PDF — malware analysis report

Static analysis result for SHA-256 f534cd7d9dafb4d6…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 10:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47bd360dfc7b13c07a3de807db23abdf SHA-1: be2850b116d62ef1a9d99fce29392f8657194069 SHA-256: f534cd7d9dafb4d6c3a64752b57f6d6eb620491e49425982b7325ecc2eb75857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=demon+souls+android PDF link annotation
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/31811268560.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/55581711053.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lazoxafudomakak.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/modogefurinekuzesar.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/31171305088.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/6764227600.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/devunamegidarilulozu.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/sadano.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/23402415226.pdfIn PDF document text
    • https://red-adlay.com/upload/files/20715821059.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/69775354437.pdfIn PDF document text
    • http://lactopad.com/uploads/files/memaxonobotel.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/11241747772.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210905072444.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409f8c4c1fe---66340402926.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79092855345.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/99044309511.pdfIn PDF document text
    • http://tradotel-riviera.com/file/2053807519.pdfIn PDF document text
    • https://motoralbini.it/files/file/30971778181.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tovabof.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/53759446656.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff7c01fbf---wakipu.pdfIn 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_off0000bb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8D 10412 bytes
SHA-256: 4bbe4a7ef3835da808925b98c0223f91735eaecb3f4fce434b565532b74242bc
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 16388 bytes
SHA-256: 5afb1d65837bcb2db527151da44ab472a4f20f7fb2248b5dc978d5cafd0fa98d
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1