Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e7e0af9fb2b5f1…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 14:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87671675e923859e45e8890da22a3710 SHA-1: e33daba0ffeb9a5f1a64e7d723b3a28b46b4f64f SHA-256: d3e7e0af9fb2b5f1f0298448e0fef6b4043062020c62994dd507467ae8c9f2b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable hosting or compromised CMS uploads. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to these sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://philabc.ru/uplcv?utm_term=technical+diseconomies+of+scale
    • http://arci-mp.fr/admin/File/mirefonejavuminokus.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6g8rl2felokqt1hpdd1f36u96p/muxefumisomaniri.pdf
    • https://gangnampools.com/contents//files/61925385260.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/62205872660ac6efa1fefd.pdf
    • https://sjalikave.hu/pictures/file/durilegepejemaraweg.pdf
    • http://atol-res.pl/uploads/file/peguwuleboroz.pdf
    • http://ascensionchina.com/userfiles/file/getod.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a12f6350b7cfa3341c70e60ac6014b32/15145494753.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c792770056---85298565517.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7f10d1f73bfc5058a73355aee355d3da/tafarudopevojudugejuf.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607040ff5abb9---samosuxo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7803e3512db2833cd9aaec2311e654b7/guwuwemisexiget.pdf
    • https://nasroglobal.com/userfiles/file/36420631890.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d994742a8---fabuzolinug.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc69095e73---numerokide.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2df7d62d7751da7943fa5ac53ba7dbaa/nesidanakaxuf.pdf
    • 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_off0000e5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 16792 bytes
font_01_sfnt_off0000fe04.bin
66bebd1e19150c907e5661bc41d2fbbd14a94816cda2209c7a1f7b97a5dccd79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16152 bytes
font_02_sfnt_off00012770.bin
742e4281bd1a358c76a22930a8ff9708e0a4fd8dbb15d5dfa62333b6150d5204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10504 bytes

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