Malicious PDF — malware analysis report

Static analysis result for SHA-256 238ac417ba4529bb…

MALICIOUS

PDF

83.2 KB Created: 2021-08-04 11:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2128f6e70e407ab4897121d31972f623 SHA-1: 922dbdeb3cf5e1493253a7da310f5a22cdb7803e SHA-256: 238ac417ba4529bbb69b41f2d9f0a6046c09ce36578d2a48ad2bcb060362f6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45ea3b526---22917323223.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fd12bf79eab307e20b2232dcfe85f438/xegawoxojejivoroxo.pdf
    • https://naves.cz/res/file/lurawenabemibatofad.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7spn67rccghvqu5eaeegpt6r3/valitetaz.pdf
    • http://paoladebenedetti.eu/userfiles/files/zupitivosamilemuwidofoxij.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/23014415053.pdf
    • https://almuhja.net/ckfinder/userfiles/files/gapidoxodabofirafi.pdf
    • http://alarcon-v.com/editor_upload_image/file/80572927612.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61517262518.pdf
    • http://nhadatv.com/webroot/img/files/novowaru.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a124fba2d61---75014480182.pdf
    • https://mn-lawfirm.com/box/userfiles/file/jedabupe.pdf
    • http://hainescentreasia.com/images/file/78721405454.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/40199143991.pdf
    • http://happysmilecard.com/uploads/files/sumugoseforek.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a33441a2d4b4a0aabc4a6316ef46e507/89460628833.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9c098742---zefur.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fd51989d---26918633528.pdf
    • http://dyglas.com/userData/board/file/97454258245.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f260b289c844c5f79127e3c59fd635b3/binuponitinutimasubobiw.pdf
    • http://leaguengn.com/userfiles/file///bolagujaja.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055d64b0098---nowazop.pdf
    • http://studioagm.it/userfiles/files/nuvowusunodebereb.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40984f27a---48853928354.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b9f33f207e622f772d08d03c886aba6b/dukisasesewodixasatapagu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=10.s%C4%B1n%C4%B1f+matematik+1.d%C3%B6nem+2.yaz%C4%B1l%C4%B1+sorular%C4%B1+fen+lisesi
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d913.bin
86be1c4cb16b6b673d49b34d6c39441cbe37a319929676bd10d3252448fa0411
pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 19476 bytes
font_01_sfnt_off00010859.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 16792 bytes
font_02_sfnt_off00012070.bin
25efe5b010d5db133df2fe6277c7e9e11e0caa1a2c4fecc7845aaebc08aef585
pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 11404 bytes