Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ff94ae40695168…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 12:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c61aca0c8ae5b32836f6400b4b7680f SHA-1: 7b442d1f0ace3a42957e54da788ca99ad982e415 SHA-256: 11ff94ae40695168c2f60a3f69741e364b768df1e7349e307b1d2d66ea5be91d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malicious content distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://nomylo.ru/uplcv?utm_term=madalin+car+stunts PDF link annotation
    • http://oodow.cn/upload/file/210916104339925038b4g0i8rwh6oy.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/65925695994.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/91879824776.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/bugusarixewekepifatob.pdfIn PDF document text
    • https://somogyplusz.hu/files/zunekidopijal.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/gewagibupirezipujopos.pdfIn PDF document text
    • http://samtekelektrik.com/files/pemize.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/39803048042.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a51245be87c599e3149e2aa523f888fc/47185836102.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/xuxosevewebezuwoxu.pdfIn PDF document text
    • https://felicityokolo.com/file/45007172478.pdfIn PDF document text
    • http://nprofit.hk/userfiles/89355821383.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/52701427778.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/fotodafazasenajugevamazu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139218027f3e---63631517763.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/82930703007.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/992939381.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/57163239798.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/70221306187.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/fukifobifurokilimisepivob.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd95e2938---54162664474.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/mizajan.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/1444264731.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/74949710932.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/dolufikarapamonodaxujipu.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16318531521008.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/63328996113.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/woboxojovagipabukaner.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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10204 bytes
SHA-256: 80b8044681ccf50237671fb48720a3dddbecd17d31c2885541f64960d52ab05c
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16968 bytes
SHA-256: 66230f0207eb174d6e9698acbfc53f598ec0ab16fcbee9db77ff34cf9b608c84

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