Malicious PDF — malware analysis report

Static analysis result for SHA-256 42109b687ec140d4…

MALICIOUS

PDF

114.2 KB Created: 2021-07-06 22:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d0bf63d901822b0b306a09c418b0df SHA-1: 99aac6f46b714379f91568531dd43c15bb0a9dd1 SHA-256: 42109b687ec140d4f68e226675b96879369e5338eeb9d680e6fdca01729abbf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://infrive.ru/uplcv?utm_term=neverwinter+house+of+knowledge
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605dc4e4ae---32914429028.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160772f3a73020---rikupetekosuxu.pdf
    • http://smepil.com/ckeditor/userfiles/files/tolavaxebuwekemulepobatix.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37cedecf20---kemefogapom.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tgt3ruq7pct1h2l0lov5rpdkhe/xomesisukisaduvuzit.pdf
    • http://altinellerinsaat.net/UserFiles/file/34528179063.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/07d6853a8d8eb124d3577436e25a726d/48434143611.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6ad83087---retiw.pdf
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/xevopebe.pdf
    • http://muszempilla.com/files/file/74402768713.pdf
    • http://akcjonariusz.com/UserFiles/file/safududupuze.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/h10bll8lji1kbr4ef1bvs5jtr2/kabofop.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06cb6f94---debisejekijukiwig.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430183637704853.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/ziwik.pdf
    • https://alamansyria.com/userfiles/file/xiwuxuzow.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/nudabavireban.pdf
    • http://driver-jazda.pl/upload/file/lagavusaxogidu.pdf
    • https://midasspa.com/ckfinder/userfiles/files/94624037271.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sdmud55sohpaq9a6qg1hehj2g0/jogibenutazipexeremone.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097820b4d195---36999824963.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6btotf3r1mafs2fjgu67setm23/xilojovebixifenup.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a8df7e2---45080673629.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608551d6a44f8---lapadiv.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11898a82d---60502597840.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140ac.bin
1e77862513b4bf0fa18b64adfdb0057435b42947fa68ca4bf2dce2e38452b5fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AC 10792 bytes
font_01_sfnt_off00015953.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15953 16792 bytes
font_02_sfnt_off00017165.bin
07b4c4c7f6f25e631b9940e0b403a957ebfd1b7ac1539561b21bf578460e80f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x17165 17000 bytes
font_03_sfnt_off00019db0.bin
6068ce2e51f1673128d8a98db1c8e7b82cc75dd033a3858cb07b0c41b92abe14
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB0 18200 bytes