Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2a6fb43ee36d1b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 23:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22666cba3b293e688122824dac8328bb SHA-1: ebdf617ce9108f229a2e517a571946e4ada2416e SHA-256: 3d2a6fb43ee36d1b29073495bb3b3f503e0f2ab25b36f27cfcdbb86b421e8f98
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, many of which are hosted on potentially disposable infrastructure, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mediasingrid.com/js/new/fckeditor/userfiles/file/66335652625.pdf In PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/80439386026.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941358a632---kalirowewasas.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/78275185985.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/59701160757.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/82690002949.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/9d9q0jnhm0ih5jdq4d7mb5q3tj/70057435094.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/62475644113.pdfIn PDF document text
    • http://chinahongji.com/d/files/66035584126.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/41743652125.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/51134147809.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090309222848.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130227932224---rogonilazejupiwek.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/61545636901.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7cc944c6---8253677371.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/ruxawozedebemijeromuzise.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/jotekim.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9814890726bffcf23b43bbc9d9d64e39/32386171510.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/kimigodovumedaxabuwubiz.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/70876844005.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/17171050302.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091203583880554.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/aeec62cdecd9c0abcd0b802896b16dfd/wigasotevefevuw.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210916062407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bluetooth+auto+disconnect+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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 18124 bytes
SHA-256: 9b4627572225d171be6f4328cefa82591c45995fff5d7f7d0a735bcd3cbbf87a
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10620 bytes
SHA-256: 9d77acd42a6a5a4a7a2a8dd7a5415df1807de916e24a94fff0f5857e74b93ca2
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1