Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9ec7c4bbd6d511…

MALICIOUS

PDF

81.1 KB Created: 2021-08-16 13:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eaba7ad0cc8e4920cec4d9dc1bbbe4c5 SHA-1: f09db8b705b14e4867323d0d018e35fc54664b19 SHA-256: 2a9ec7c4bbd6d5113d2aa612ebeecb735daa6c388669189351c696e9b26af064
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://polymer-optix.de/userfiles/file/biligozofuvogozu.pdf In PDF document text
    • http://fkhd.cz/data/img/45093363154.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/36442277874.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a34cec04810190de3d755cef4b7ad6b0/51328596960.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/nikaginigipodebixifewum.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/eleb0tn9h1bmc7ueluj5cphvp5/bewixifumugojusim.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f0847c6071f29454d3a229d28bda3aff/dilizegixepefogobututox.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e20a77f50f2f7fc65ec61bb3fb56e00e/88332808709.pdfIn PDF document text
    • http://15881588.com/ckupload/files/bogamurugok.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/89563538885.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d29217f58---71714187463.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2f7dd0ba7522a20b191f96f87059945b/kakazudimuku.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7goi3se777uae8e9tn8nfo4t8v/nenon.pdfIn PDF document text
    • https://soechi.com/userfiles/file/sabekuwe.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bijepoloru.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bd0599b666df72192b5e20921b296ba9/94016390730.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/safotapolapotutipematap.pdfIn PDF document text
    • https://sambelteri.com/contents//files/53272532308.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/v245p9o26pe0vvrrugrjmfmhei/fedowutakupegoro.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/matifedogezux.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6f10773d3---bipuxeva.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16093e8b798605---74770959831.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a98d8d69f2d529356c7ec66ad69c2d03/77026783403.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/696b84fe9b7fa85960d3efd7657ad850/vikepagaxi.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kobepapejimowowufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+circular+permutation+formulaPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 17208 bytes
SHA-256: 824487ee66ead06bad4d0849ed1f1b59990a8c1d92f82d1f28c12c0a76170aa0
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10840 bytes
SHA-256: c7da9b4f3c4edab1aaef843f2ee535f17359346c6bba249190b20b568ba814b6

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