Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1e5eecc834279a…

MALICIOUS

PDF

73.7 KB Created: 2021-07-30 04:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a28a5400573351f8b3d19a2a5f493633 SHA-1: 8e219c3f5d10311ac51c9c82e9d79d4910c9c4ac SHA-256: 5f1e5eecc834279ab9f2ae876b89a7714419e415aea5aa913dfee26e41a9c67d
172 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and links to multiple compromised websites, some of which host other PDF files. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further payloads. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/136bd6d16c4bf75450ed0afcad2616b4/warojasasivubakimowas.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hdc76q9c4ko9p1fn2l2uvploe0/visilosariwaromifipopo.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/13004023729.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723dbe4006b---20249992521.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da5e885b146---62845461523.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/42715588859.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/10056659639.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/nijemuvoburerosu.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tixenegurifoxaxu.pdfIn PDF document text
    • https://ivanamihic.com//files/31598782000.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/turivexip.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ea77b80fc1c029109266614bdb5b09b4/71027609966.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928d12d71bd---13073528286.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d954a8284eb3e8dac6542b2e3b74a805/junadibefelelurite.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/ririxiwepixixexumolunaje.pdfIn PDF document text
    • http://brukbet.com/user_images/file/53388457675.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/57614641834.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/53912492064.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37019771645.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/vubebusujabedanoge.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0f9191a28b52cb9d6ef273d027d41098/pejomezi.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/87078366338.pdfIn PDF document text
    • https://capecoralliving.com/media/file/78486336324.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbddde7dea---74576507538.pdfIn PDF document text
    • http://linker-apps.com/files/13458008163.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9e76738dd---17656115779.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23620183d---togofaropotawalosimogagu.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/22104897897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=9th+class+syllabus+of+englishPDF 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_off0000bcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 16116 bytes
SHA-256: a57660391af943564ce1110d3fe24d78f7a5b93399c7a87fa3eb0f50727f66c5
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 10940 bytes
SHA-256: e1ad13ca5107c1c5501b3c60d4d0b478b04fa55e904fe4933fefa60fd4f216ac

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