Malicious PDF — malware analysis report

Static analysis result for SHA-256 54efcdc7e106b692…

MALICIOUS

PDF

81.0 KB Created: 2021-10-09 13:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8752108c14c7721ccdbd239cdca8a01d SHA-1: 9d37d9bec709f5af4f3007a91d6410fd4ad1ddaf SHA-256: 54efcdc7e106b692c9e0cea9fdb1811e5c242108b336055cf6253d35cc298f04
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating it's part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=black+defence+chess PDF link annotation
    • https://nycsmindia.org/ckfinder/userfiles/files/lirebajotemu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2d7712310---koxolibi.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/poxitu.pdfIn PDF document text
    • http://clingac.com/d/files/pokilavinejuxovi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/64116976744.pdfIn PDF document text
    • https://kawanmto.net/contents/files/39923223105.pdfIn PDF document text
    • https://ubranni.com/uploader/files/95589053490.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/pimoginak.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210930221128.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/2002617243.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/12609820226.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/41521422103.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210906081853874209rnf5jk8xzgmj.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/gaduxobosozek.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/fagivavilirabetosopibo.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luzif.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/pinosirutopanitexibo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/2851412569.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161327df59bbbb---86317577089.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/46323979179.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ce7deb6f222acb9ada782ed502cd99e2/38906298484.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1be4129c9---27782392249.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/98801389613.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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 17508 bytes
SHA-256: 57c5c8e21d5fc2e3bca1cde569c19246efbe1cae3782469a6cb131037e88232b
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 10308 bytes
SHA-256: 24f61992b9e2ca9c98b866e66ce13dfdd73529bbf8b98a4f5452b641788a6315

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