Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e5d11eafea8f19…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 00:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04259b49d96810f6215817a852337d51 SHA-1: 4950bf6b590ce157d68672371b16643b360cf7e9 SHA-256: 43e5d11eafea8f193de879e2e8991a5f3ab778a8a320e2de4079050d84e2d0af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs users to enable macros or editing, a common tactic to bypass security measures and download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://krisoc.ru/uplcv?utm_term=merge+worksheets+in+excel+2013+vba PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8233e1860---sesirijazuloforeda.pdfIn PDF document text
    • http://ecole.ru/text/images/file/juzuriximiderafekovuw.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/377263e0aed58fc3d99a3e7cd5a33855/37988950398.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jeginonakaxegixetimajam.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/df0rs1uajh6ldpp1r7i153e1aj/27299055564.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/jafufowowosusidadarafu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d490cbbb---27660107919.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78410740833.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sekazuvujoramuvimebuvu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/13930638917.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/lipexe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/df2c0c7acd9613f73953255a233475cd/mototodesuredepajodekemep.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c04787db1b0---guxuzomilolukowoxixinup.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210830182319.pdfIn PDF document text
    • http://toroisg.com/public/images/files/80379262863.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/kavudijafugu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca840b287d---12618412157.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sejimosekivaripe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c4848c7001e4bdc5b3600cec20cd5a08/topopilepobunugen.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/datomobunuzimuzixakese.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xipafolimokufeliwemomur.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/1017425272.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/04930cbfb09ca6bd0976c1c34d396611/57841848566.pdfIn PDF document text
    • 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_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 11456 bytes
SHA-256: 73ac6a3762f8791915213396faf20e554b2f91c473cf8b592e61664e29c6461b
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 18596 bytes
SHA-256: fbe17e7f7db20a083049611c934065274dff641c98655a51959330613267d4e4
font_02_sfnt_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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