Malicious PDF — malware analysis report

Static analysis result for SHA-256 243e7459b4e87cc6…

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 00:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a223da5082179c537c301a515c523e77 SHA-1: 213d20d61a75abbbaa60fb6804fe22751ce1d092 SHA-256: 243e7459b4e87cc61036db3c79f86e18fe80b95ece007c55343a9008840166f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073914d73afb---momijibigetovax.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/113892028c08cf396afc3c9d38acbf9b/52883714597.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/99953406485.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/23993313347.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f029a8e1096---zimiwuvepuwileluxovowirub.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/9577119175.pdfIn PDF document text
    • http://odumakus.com/uploads/files/10630465761.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/edghttel6ulngl6i4bdm7fa9vs/xinekoxedezesilapukaz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tijuv.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/tamokerukosivufemux.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fefetupesulo.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/85113785166.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/75961011407.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/11325964945.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/82626830777.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160826386dcf56---zewaredikopetesog.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/59288822407.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/xukivo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac06a9cde---gulidafedotovebenizojog.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rewaxatevulefuguk.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xipap.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/56222219948.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9c570333428246634b3e8f71d000c7cb/tegodepakozigukumo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc612a9fe---29145259501.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/dca328abb9d150d21211c648de058702/55827541805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=daihatsu+terios+2002+service+manualPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/retedu.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 21448 bytes
SHA-256: 2f43992e9e3aa3fbd449c78843715bb51f75658ab15a4722a3b23fb626e2418f
font_02_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 10904 bytes
SHA-256: 9072081c64cd1b7cbff1f1db0267b627aba81005dad2ff274c3ce86d4cd0a73d