Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3cef7fec20e518…

MALICIOUS

PDF

98.5 KB Created: 2021-09-15 16:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 752648f30473dcec6484be4ff0dc38c8 SHA-1: ed4e427c80a6992e601d13d4b1d9ffc2ba8c9eb5 SHA-256: 0e3cef7fec20e518adcf42be38bc9a61b20bcacb943344fce3161aaed905b4ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jezirka-biobazeny.cz/UserFiles/File/dezowidogujedixamo.pdf In PDF document text
    • http://acsalma.hu/userfiles/files/81347738813.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/41901146018.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210915_075620.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jovotisenokiviposab.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/segalojupenopepulosed.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/ziwewetimutowat.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • http://cortabellanews.com/userimages/gejudul.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wegesimijis.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/wujuludibi.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/19867687817.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/larifiwinonenasuvupoto.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130180070de9---83776785145.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/giwapekuwemo.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/dirijorinumaliva.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/pesufisunazezodobarejinad.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/61767672596.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/44216205173.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/89247427552.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/5052697002.pdfIn PDF document text
    • http://julianina.dk/upload/file/28604522281.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb27a45359---nozupimewupape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=como+configurar+proxy+no+androidPDF 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_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 21432 bytes
SHA-256: 0e6e1c2604f4f24cd3ee656b5d88b2b93d208ff785419c330cf8d4b7c0464925
font_02_sfnt_off000162dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DC 10864 bytes
SHA-256: de9dfb92dc82b0f6235cdb8e2a625f225ae6967f2e293d99688f56bd6271aba8

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