Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c34c77a9a1c54…

MALICIOUS

PDF

91.9 KB Created: 2021-08-08 14:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfd0fa462c5a59d3ad0dcd5a78c82614 SHA-1: d30c9521fc7c6995d276d1a6b362f4cafa37790f SHA-256: 109c34c77a9a1c5405ca0118d0143510e3c6b7c1595d86ba59b2f8f9759b4ccb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to files hosted on compromised WordPress sites, likely intended to lure users into downloading further malicious content. The presence of multiple links on disposable or potentially compromised hosting reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5f5705c1---66641801338.pdf In PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d818bcdbb2---73482073800.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/wuwakukugijekamoguv.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/votudegesuzuxematemaju.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/93243307d6f6faf20c9bdd29e5b2c887/7505207243.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/retulezanovafex.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/47116583108.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0af89ad296902c8d18f8a486e2687006/45235066775.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/olf4vusjk6guh2o2a0a8d4hr65/legoweliwiwezezer.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/dbfa45f10c23969ef3f4241bc119e89a/10660900914.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b547a307cf0---bufev.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2io410p0u79abiuhp4hobmvv7/69546060042.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbb6014d26---93100562971.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b89b58fb7---sotijabowida.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/vckun2mfrr9qs3us2rb68mi59v/26572754076.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163777ad2f---45617146938.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8ee0e904---28616985352.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46619e58---83553321643.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/guweliribuzu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90135088670.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/86d67db0b9cf9257963768b721d384bc/sepemanuvunaj.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/tagerafuxebe.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/gunodelolujuzekelabimowun.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d00c4ffac---67993714862.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/52003919324.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/78027885961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=el+significado+de+sentido+literario+y+sentido+figuradoPDF 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_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 10848 bytes
SHA-256: 36954c2d667eb10926c3489322c7dc70731262fcb6b4e27466eafa56f400f6c2
font_02_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 21752 bytes
SHA-256: 6729b77d6ddbbb764b4ad55bf763beea85aad46536c694120c2f25f8d9ea8fb3