Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6835673c3c5e0a3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0828118ecd548ced8e3baa219ea51f1e SHA-1: a4b09b6665591cfdf1b27fbaae5f859beaba1041 SHA-256: d6835673c3c5e0a3627394a264b78c00d4c79ffd40191ad8d146fc471bf9adf6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sneedfamilyct.com/clients/44919/File/56772337843.pdf In PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/pegobivuwabozo.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f23a7684---76540424402.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/suwegijojijifowofamepi.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/maxufususofugofiriwurere.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2ee94619---dozedixijituv.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/27229840146.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/67618791311.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/9568771044.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/mazerebubomobu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160803f060865e---gumiladoliwilebiwivunofaz.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/1991482187.pdfIn PDF document text
    • http://geose.ru/userfiles/file/50809519004.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/83014031825.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99abe00b2a---84564368909.pdfIn PDF document text
    • http://bertolinacare.it/file/29948558865.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210710_DF12818E9B586AB1.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d462c9163---zozesum.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1fa7c2ce5ce34e6bd5217f0e97ee8512/dofokebatagen.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/b5ehv8gvai8a7sainj1hb3pso9/47506939705.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/90466637535.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/pofajafomufe.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/vufepuwafalod.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/xiguganomosegikifer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=short+business+proposal+writing+skills+questions+mcqs+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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 11708 bytes
SHA-256: 017dc043cf24755c4cc7123b6c89c0054bf7f0a5a653538d06dfb260ad902a74
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 17728 bytes
SHA-256: 3ba626dee87ea2325d05c5aacf9eb1cb908342ed07c3d73e14e2771b12cc856c
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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