Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba703ede5e9df121…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 21:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20d22359be01962accac13d993290a91 SHA-1: b294faa4b3ccb3cdc984ec46b7a877f44feaa14b SHA-256: ba703ede5e9df121f63e85fd14e67b19b44d6a14d41c33f4f33d8a068bec4dd4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious activity. These elements indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://sokolzgierz.pl/web/uploads/files/rufimesoridifane.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p3v6m4gnr5oskspt4f7d10s472/91742093112.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mabesowifonew.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/guniradifajubiletafar.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/65997759145.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/zobuliluxepa.pdfIn PDF document text
    • http://373113.linker.tw/files/167439274.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/21357225090.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xosivodopetaveruzomaje.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/tawanelo.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109082008419444.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/54850882541.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tunifukibigumukureji.pdfIn PDF document text
    • https://satesayap.com/contents/files/gapobexije.pdfIn PDF document text
    • http://cl-pub.com/files/files/8779370370.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7f9f1e83---91213283596.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/9392001449.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nepivulo.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/guwolem.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/pexoguxofiwavu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/tigekujomuvekofof.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/60262538650.pdfIn PDF document text
    • http://konberdbio.com/upload/files/mozinaxizoligefexexi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d4d39d2a---fivuzusibatovofefetopag.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/61715927101.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/48519187054.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/limegutugoneludozavotamed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+100+season+7+123moviesPDF 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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10672 bytes
SHA-256: cb76ac8e4782fdd09f5c038e47a84f4cea177cd09f331c57ac83496cd84dcfc7
font_02_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 17696 bytes
SHA-256: 9f161ab62fa4d5cffb31ca3bdd33d3fad01589e37fed854e267cefa66e903022

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