Malicious PDF — malware analysis report

Static analysis result for SHA-256 963c4cd3c1382987…

MALICIOUS

PDF

71.6 KB Created: 2021-10-05 11:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b105384b7b7b6ad3358776130efcbf8a SHA-1: c94a2eb196581e3b287884866bca87715a9618aa SHA-256: 963c4cd3c13829879d560dcac45a3b6621348cce7b2cc2167bc28d90c0aa14f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ardennes.proximeo.com/ckfinder/userfiles/files/65863804048.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152091a65b30---2529210698.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/wezenebuzuxodit.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vajigexatolokizijisibotuz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3bb04815025f5760dc109db7a4ad7003/fekubuziv.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/xemusidanog.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/41595579276.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/19245203296.pdfIn PDF document text
    • http://donghotam.com/luutru/files/juxedur.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/31iou5g02nmppugitm3vqorni0/87134332334.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xazofiparutaviribi.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/raborenusopamoredixalu.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/33649471148.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pefimip.pdfIn PDF document text
    • https://airxps.com/userfiles/files/84339307105.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210908081659.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/wonawosulavozeb.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/vakelefenowafaleli.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/51897363558.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/72874506476.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092204130473499.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/12539622406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sexy+picture+downloadPDF 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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 10816 bytes
SHA-256: 6f08fe5d1c83eb6cafcabcc7134b37934a92b8989bef2401c7b3e7a76466afbb
font_02_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 18304 bytes
SHA-256: d76f467c4343a54ca46c701250088ee426fb2c6ba066f12bc4d5f85c00b32584