Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edaaf103d7b793a…

MALICIOUS

PDF

94.1 KB Created: 2021-07-13 17:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df06c89d3a82257abd85186137e62b69 SHA-1: a2d55ef3327d6ade031d9ca2043902a95698e5e9 SHA-256: 3edaaf103d7b793a8e8dbe5378212806d2e0e5101b8775c08372cf781e4de9be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the overall structure point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=travis+scott+and+stormi+webster PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bc915b7fe77390808d226ff37f8625f5/jawajiwoke.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d7080ad8cbcb924824901e25b8496e2a/85698001709.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/24903563961.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lodegili.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee5f96faf---tazebunozorexajamezute.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabce2992f---46724379153.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/2f2e13ce4ffc1fa5dc3703e9d6ab4b83/lunezoka.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb66311f6---dufewezixunonanobis.pdfIn PDF document text
    • https://senhewood.com/d/files/3308575853.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af96f20bef8---zewexoge.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5ed8baaf---48652473233.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082683509f70---bofesadofofelatirupoguk.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b36807f2c---ronakinerok.pdfIn PDF document text
    • https://digireg.se/upload/420394889.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1811278788---sowiwunanazinesipavepoko.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097acc06ef2d---39501093682.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rifisirexezos.pdfIn PDF document text
    • http://geotersrl.it/file/tolojivusukutu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/63808482037.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/96462958687.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/29eccd5a5d3a0302e8c2085002077f54/fegofivifigunukox.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/53157879409.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30cce3a38---lotigirilelatoge.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ef93d062cfada24467c360cc94c286f7/78280047277.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16468 bytes
SHA-256: 3f777e5ef6ba8bfe5cedc83358ed4b0b69524b030ac953b10772249fd7679c40
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 19316 bytes
SHA-256: a1a41cedb04f0f69dce6a15ba52bc5dc9e290ff774e5ecc4e84df6cede17ca25
font_03_sfnt_off000151a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A6 10740 bytes
SHA-256: 42e5ac85ae61327cb20f6b65087e8ac7e4bd4e8d9a4299e30e73d56aa422926f

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