Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce947ef7bc112b91…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 23:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d515f73ae0dcc9a6bd3671d175e3a49b SHA-1: 8574aac128dcec846ddd45e3c06209ce0fafddd0 SHA-256: ce947ef7bc112b917cc7915a932a8c1cb6a4953d0d6c93aea8b9e36f1b023972
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for malicious redirection or to bolster SEO for these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • 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.
  • 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://hotelniagararimini.eu/userfiles/files/71422624151.pdf
    • http://www.srijonihealinghome.com/fckimages/file/61558456154.pdf
    • https://elitstroycraft.ru/source/file/93786513656.pdf
    • https://minlinart.com/archive/upload/files/66823991903.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20337d5f7b---jevibazuxid.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a0e80bc2f6f354ff704c2fc73fb90bb1/74518858395.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa2dfa6e4c---joditexafu.pdf
    • https://hgb.se/filer/file/xuwitakapalub.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/688a39c478c3d68b3b838fa1ff0d5e36/kitoporevax.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3158e032---xebudutefufa.pdf
    • http://liga-stf.ru/i/upload/files/fazasunuwilawexu.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/uncm9jtqghmah48p90ufuj60c5/datopigupagejegididoze.pdf
    • http://thingsantiquesla.com/userfiles/files/50454400943.pdf
    • http://sro52.ru/uploads/files/64198963212.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f63226831049e0dede46ca51ebfc7e4/fajuletesubofojam.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2657df8e---92063814676.pdf
    • http://restauraceeverest.cz/userfiles/file/sewazazevizepisi.pdf
    • http://cga82.com/admin/File/xogubuxidi.pdf
    • https://tatvan.in/userfiles/file/38846324589.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c630b3bc5f7e591e55da56b6cabfc434/kijosilulaxirozab.pdf
    • http://hagelkonzept.com/userfiles/file/begorelo.pdf
    • http://grupopiscis.com/upload/files/ruvepizonezufe.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70026ac75---63592909751.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c500e096a---71213840882.pdf
    • http://www.anjhimayath.com/upload/file/dezowujapisoroxifim.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ed4ed4f---73289864935.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=adjectives+worksheet+grade+8
    • 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_off0000b819.bin
1469a8599d824e6017c1ad796173dfa2a7e9b57b32aff94251dbf6b142501036
pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 15152 bytes
font_01_sfnt_off0000de79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
font_02_sfnt_off0000f690.bin
f73b13713c5426287dec0ef77168ab132e245190c52877471f9a05e346e242ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 11060 bytes