Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda608142d1bc369…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 22:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0db7b692ac6474909d701014828f74ed SHA-1: 6d93912a299623557f9df64558c36988022bd1c0 SHA-256: eda608142d1bc369d839647eac9d17d862f3a5d9c453df15c6d2d5eea5da1559
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for SEO manipulation or to distribute further content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=geological+carbon+sequestration+pdf PDF link annotation
    • http://phannhan.vn/files/usersfiles/files/77471362519.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d799db7ed8e---10997723720.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/93730492738.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/temidogowovizuv.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/69544308316.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/5e8eqe05unpi323ev9koum46q4/73596990138.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/dimepukekedezunexosexivum.pdfIn PDF document text
    • http://health-bridge.in/upload/file/natojukuxeleraxogabiwe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeccecba1e---21008933693.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/29068766630.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/mojawapisuwubobalezot.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628134602385.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/zamefeziworig.pdfIn PDF document text
    • http://lawngo.net/fckfiles/31066739319.pdfIn PDF document text
    • http://rc-modeller.se/images/file///favuvekuw.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/7870f1b9d6ace11dd8f605938784760b/vejowoxafefem.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161286151c0fd2---59254179806.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/dulovoxipezas.pdfIn PDF document text
    • http://atomleasing.ru/media/File/73448994780.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/81616566770.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/541b10mdd6nv3oki2na6640cc2/fuvipejumapevexijamimugub.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/0hi5kicdsva6srcca5416ja68g/wuwoxabekirodiw.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4tvc3s2mt1m3dgemcg9829uqaq/dudubegu.pdfIn PDF document text
    • 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_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 17288 bytes
SHA-256: d5e700d833835c6e5528fb35d8b1c6e0faf272847cff907ce3836d9ae7fcd1de
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 11220 bytes
SHA-256: 2f39f1900f2499b00583378664c0ce030cc9ac9aa7c85864579e462faaf14efd

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