Malicious PDF — malware analysis report

Static analysis result for SHA-256 a300b6f842ba6b14…

MALICIOUS

PDF

73.4 KB Created: 2021-06-26 11:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bde471a1ec06d33ddef365c7c6d462be SHA-1: 28eb7e5cbb9811935fefbba0e944e94c43855cc3 SHA-256: a300b6f842ba6b140461da88e9a82f75528f0885dc61c479682de97c58093209
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports its role as a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9scjc4g9e34i963heasta4ptr1/38045450184.pdf
    • https://advance-pack.com/editor_upload/file/bufig.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/od5fdvbjnu5qnsf1k09cm6e4p7/53868802431.pdf
    • http://jshtextile.com/UserFiles/file///58883894869.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692ca2b96d---wijijusokisikorabixarit.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9721c8f73a---zajagedowisub.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c19b25fd657ada1fdc730680807d3762/7371995079.pdf
    • http://yuha.be/_files/file/jemuvunasujupolanegefum.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd543373---65375815965.pdf
    • http://pokeocncafe.com/uploads/files/75807214925.pdf
    • http://deryalvincotokurtarma.com/userfiles/file/72300459469.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/nizemup.pdf
    • http://innotec-industrie.be/userfiles/file/pirokibirodexewipa.pdf
    • http://bannails.com/fckeditor_userfiles/file/debuwopuzerafukugijowesu.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/emmhpgnna2ff84pdut93hapqca/38752565503.pdf
    • https://alakharia.com/public_html/userfiles/file/jusak.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab02170633---rozogadowobinirukido.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080edb8d7cf0---40878813361.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/06abad1bef6678ef65750979b07c3f66/21816240337.pdf
    • https://sca-kc.com/scauserfiles/files/muwisusabuwumezaxiza.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/5e1282bd439fca17233d98dc2f5e1b86/97840717880.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7cbdac6cf0cab0b85c3464ec6a49c1c2/wiratisitulogalu.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b23c0f91---50639818345.pdf
    • http://to-kajihan.net/js/upload/files/jezejuxewud.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=first+student+bus
    • 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_off0000bff3.bin
77183b981edab03bf75edd699f055dbc3ce13785fc70b70da5b0a6f97c05770a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 10132 bytes
font_01_sfnt_off0000d6ac.bin
d0f5656dc191b46ec731cc173fb8dbc2bc9c82fd188ee80badfc715a76c50a81
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 17020 bytes
font_02_sfnt_off000100c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16792 bytes