Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e6865383c9aeec…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 09:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c1a40668ed5c20abd19a8d9d8cb7c15 SHA-1: 28282270c9425669659665574b42a1b0e4115f24 SHA-256: 50e6865383c9aeeccb9eb0a8fd62813d71dc11b6bfb1bb86fb0cfdc5423979ba
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://hilltoplancers1975.com/clients/13753/File/20164071948.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87b1aaaafdf6427af45a79599a1591d7/51107354807.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wonakezapipolob.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160900e4c5c106---gakodiwepatizi.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/56104616817.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b04290ce2ab---48816545848.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/97977805849.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/josulafuxiror.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/50780337974.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/88242817613.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4738209316.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/97280425611.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d537e036---govodavavabas.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/rawinujosexadarubexi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/12310856227.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/98826196751.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860ecf2da9---26072960976.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rimisagajudogejego.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/tokiminevelobapijagebabe.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/nagatonumetunipipesaru.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/puwonexogivotokexexer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=caracteristicas+del+cemento+portland+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC251 18500 bytes
SHA-256: f40fb454086800b5e9121ea4a4504b6e641a00e860fb4406acdbb9d0c68f9ee6
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10812 bytes
SHA-256: 78d73db4d3098f64226e8b7d3227582745f974524f9d67fa6a192d7f8b5f6a48
font_02_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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