Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c359c7c6c512c3…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 12:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d30796cab8d8295ad183d8d2f92899a4 SHA-1: 34541fa50d782a172342eda1801fd55292009eb8 SHA-256: c6c359c7c6c512c3761d2c3f1759252fe45b006df50ceb06f407f9ddd52945d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://kingkady.com/uploadfile/files/46297025831.pdf In PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/rutimajuzoviwamifikopa.pdfIn PDF document text
    • http://hidramaco.com/files/files/93686365365.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nagubarumub.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080712222076.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fd1220a48---76029744802.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad12a5e136a---39320336234.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/20779972913.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jejakafasi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2246832b---49186742221.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jajotevojipabim.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jadik.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sobosumosifa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160efdcc68b43f---4595651417.pdfIn PDF document text
    • http://come2menorca.com/images/file/nivosizubosapoledef.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210823_830F665FD812B202.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/92878756294.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/i2a8l5v4dqib92sfvckg34m1pm/63829737364.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/45915440665.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cbf8dc1e5f52d9100222d93a7af26b4c/47626208514.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210701_004810.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3e62b34ea5e258bff4a503d34f7d7d6/48907097195.pdfIn PDF document text
    • https://businesslife.com/content/file/vipateduxuwogelidak.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/44128435631.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/63972794653.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbd1e7bcad---foteguxisaveto.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/83722872595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+library+of+babel+borges+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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10792 bytes
SHA-256: 23385b4ffa5e6838d4b0b2bcbbc0af16eda8b555ef0d68fc8b51cb5b6db67936
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 18672 bytes
SHA-256: a3bb0b9dd2d9957d43fa0aa54068579267b07febdda3d740f2d3d4154f31b331
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1