Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b6c8e790843ae7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 01:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f54c16e86a138fa3c4d4519666aea900 SHA-1: 0a185b6aa8f0a093db7726f0d4f88e4448c15588 SHA-256: d1b6c8e790843ae735d7b09274d1468a20830d72212b5bb36aa3be78a701bbe7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095417b02e26---jenanitibidosunituwugukig.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vhh75vg4s7r3q8dumcbtapnra7/vebakugutesaguzamavawakat.pdfIn PDF document text
    • https://andana.us/files/files/gupexumazelafa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i16vrqh91q5g85e9kqlmr74n1v/54128794311.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/jamejukami.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72543649c---71764456850.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/ponubilexojajes.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/mozifidowivikapo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ceaaa650cd---wojogi.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/94247689728.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f197b349193---bazoxujosidulumijemumaga.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcda56f5c3---68334638566.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zimoto.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5de2ba56240f535f82eacc6bc55e6ab8/pomajeni.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/deea70133fdc699e8021b34d61566a18/89618531755.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/menigakopawepuxeku.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4c370aa6---12756229493.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/84603750068.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/meveza.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/16597694286.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/xifititikivurefet.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/gusisusanegoj.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210803_D62863B5C0F765FC.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/86528557981.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/50626f4d971b5723e25c2a62affb04e5/50482445264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gst+meaning+pdf+downloadPDF 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_off0000c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D2 21136 bytes
SHA-256: 052518c29aa508f152353742164fc9e808ad2664f2567059e49ac215554e11ec
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10864 bytes
SHA-256: 96bcfc9cf6584ed5534873e98fa4b090f773a7244e724d847617e1ab61403509

Open this report in the interactive analyzer, or submit your own file for analysis.