Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4199a1b9549011…

MALICIOUS

PDF

75.9 KB Created: 2021-08-28 22:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a53350f91d4ff298a274e72e2ccf513 SHA-1: dec7904dd9a01746f02bc972cf2dc19b4ee44e05 SHA-256: 7b4199a1b9549011750421ffc2c3f7a4bef87ebbd785bad34bf4fde9549652cc
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are identified as compromised CMS uploads. These links likely serve as a link farm to distribute further malicious content, potentially leading to exploitation or phishing attempts. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e7db74dbf12b6d547d7fbaa22fa95d97/45254532249.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d82fb46d05c---wital.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd120b99b4f---49162228763.pdfIn PDF document text
    • http://zgic.ru/!upload/files/1448791978.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/545f3df43973f73fb5e7fa392c5233bd/junekovukavatudalar.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f64d1530d---28089649514.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/393f33800dc0d4dd7a4628b1b3b82eaf/49466728196.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/nazixujetizazegew.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/wowamoniv.pdfIn PDF document text
    • https://hssanesteban.cl/files/5268705660.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/favajivukafibobumilopewil.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1945ceb1---nonis.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca996f78f54---xedakosa.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/76790646053.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d5db37b7---wulegokobet.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/puvegumojejobix.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/49385094173.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9a84f447eb8029316995dab438d99eb8/9528744096.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/93766309501.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1560592b0---62546467855.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/hd7074ppihi2tishj3odgva4d3/tilol.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ccba1172692---84192058624.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161233be6f0060---mujanozera.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/nonepexamusunuse.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/bexuj.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kibonirodipipanum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=anatomy+and+histology+of+the+pancreasPDF 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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 11164 bytes
SHA-256: c2484b7438de5d6a4d81d0569e22e8b8c279fc9d87a8ad89265681f98e465d6b
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16572 bytes
SHA-256: f5c70e23f32630df91c647512c41276ae610d96a973e800fb41329c93a2cc692