Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b09751187ce170…

MALICIOUS

PDF

107.0 KB Created: 2021-07-03 22:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d7b8d346cfd8d02b4512ccbc6aae17b SHA-1: 5999a371459c1e9def9457181039bc96ac390d28 SHA-256: c5b09751187ce1700604e31ec61ffbc2ba4a99922e83b0bc00385c8eeca4d744
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://dogathermalhotel.com/resimler/files/kipawodawozapuraxe.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/mojasofagalonijomasalitox.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a06eb8d1b---45160193114.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/14656221446.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jebesaxebivivezoki.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bixegesurawepuwo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/74866208811.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b326788041d---subomibulisivovunotuv.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0811776001624751420.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/fagasiluxiwematanupevuki.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb23c0813---ponupifulipamilan.pdfIn PDF document text
    • https://avvocatoboretti.it/file/busizotedov.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/11315db5ac83885f48df1270d7c3a05b/70470052851.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/30752186357.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f7372fd---46408530364.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63715bad12---51408977361.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/73639411697.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1f00dc1f55d372c7cbeb516d066f41ee/1309616105.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d71b0293---84531908912.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae249e922f1f8622aa2c840f1d35c475/jitetususubovuvenolun.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073141b86254---90728958758.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081395f91758---30968479163.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a55402c38df---37941752785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=st+tng+the+gamePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 17548 bytes
SHA-256: 64b98800aa3dae77064fc5c5fef6ea03aa33a6613de6585df155017cb45e69b8
font_01_sfnt_off0001670f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670F 10104 bytes
SHA-256: 0f1fa6a0796f45a8d87224187c37b8be76cbe7b2f5fa6691537610a76af61589
font_02_sfnt_off00017d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19577 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832

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