Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c14dedffab5650c…

MALICIOUS

PDF

82.3 KB Created: 2021-07-20 20:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90c5798c26d049f8604af377427cc643 SHA-1: 8880fc0ef08fa603566379734a3373e37b57b4dc SHA-256: 2c14dedffab5650c7feb5d18da8c737782e1e3793da7025335bc6e92b6721a5f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a449b27978---rixekowarexubot.pdf In PDF document text
    • http://aklond.com/UploadFilesfile///2021051516152619.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210623_9DF040A9463D4198.pdfIn PDF document text
    • http://fxmeat.com/upload/file/5ee3b1d21665df0a4dd42ed0708da21b.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/gemopodamudojisuvew.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/58065081603.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/713cecabca5c954e9f626bc5aa7781f2/ximotitikexav.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c34da1827---xubisogofodisurimiz.pdfIn PDF document text
    • http://scantech3d.com/files/35465818431.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1deu3gi2itba1vrrjfn56phcr3/2370550266.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdaa8f520---45459790351.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/bizopuraxosexupu.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/dazan.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/46857749990.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74238176d---niguvepa.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/59927024897.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/1985217742.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b44783f95d1ed825a9da1a4782ec8f66/61828161096.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/85496778751.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2vt7fb3sp774aed4lo019f8j4m/gubikotifedutike.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504155650156.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85e0e0e3e9---jeguje.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/63607886687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ark+of+war+galactic+campaignPDF 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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 17248 bytes
SHA-256: 62207dd1bdcf5270b1eaab4ccde95bececfe970e90a2a6d91f62489b8d2de83d
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10680 bytes
SHA-256: b386bafa9e80112ef13fa450b18942b820b95b2ec562c965da2c68effd5fb1b8

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