Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce528d080c01d5b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 01:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85134fb74f181b111b9fc78c983ce459 SHA-1: a40927fdbf8e5811a4033b4f551af23fd4599b0a SHA-256: dce528d080c01d5bd150e3958dec39bed2f68e5d892e843fffa0d48bada72a2e
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 obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amandatravel.com/userfiles/file/jivupenigug.pdf In PDF document text
    • http://smepil.com/ckeditor/userfiles/files/pifodibutiwituwovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c967db58017---93783568323.pdfIn PDF document text
    • https://le27.fr/docs/file/90320878917.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d2f4bce6093af8947b354ff94eee1bb/nusugowupik.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/sobajoludemepadebad.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160787dc7d1505---genigimululorujij.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6bb1e5c2---28420522963.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9650b1cb6---27326748375.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nvk60vc2mmobkunp1e8k5tfv5n/56477167828.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c542a915b05---vofuxaxig.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/bafazi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/tosafipena.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/85450275877.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27633709861.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/88311383938.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/35102379331.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/tifepiketesisapatolub.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/39835116629.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/dikubuwuxijokizekafetowi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd80a5e989---nizugike.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/grh3pj00peubshtm4cdgd98gp4/51364453370.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/diviviwenawexumi.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/64322379338.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/54932999455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=global+business+today+5th+canadian+edition+pdfPDF 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_off0000be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 11144 bytes
SHA-256: 014067fca96b6afd142cc79243862288611541c07620e066ef0325570895a220
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16508 bytes
SHA-256: b772424c0c6a2fefc43f010553c3f2986b4a58ef689106c31f125a923b2b9084