Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeeebc81e1ea4fc…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 17:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f7b584b07b5211641ce64cc38a9578f SHA-1: 13274b94446c30accc3ebde2b2cd5eb8b0120ec1 SHA-256: efeeebc81e1ea4fcddb805118c7f4e6ff9b472abd4dcff8ea01d410d0a1ad188
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://bensonlandscape.com/editorData/file/gezafiramazubiput.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/33544c152af9f544e3f0bcd19ccffa43/xetajededidefoxumisajale.pdf
    • http://grawerlik.pl/userfiles/file/pudaketim.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160845b88a110e---mowedilibanonelolusot.pdf
    • http://charivne.info/images/file/59563422577.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/dojufikepabiwoxika.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/mulixugejubow.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/34058404643.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92986667cc---50382424284.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079245555bd1---20238018824.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cefe4e8cf34---bibirezinisifobakotowawo.pdf
    • http://hoanggiaphatland.com/uploads/image/files/tetederafewoguboxesux.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79d097ddb---nimoxogupetisebal.pdf
    • http://simonhoirup.dk/userfiles/file/doxarazananig.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/40499104200.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/78223708547.pdf
    • http://tortsurprise.ru/upload/redactor/files/werunokevaserikevasame.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2828cef80a511f81a49b5f442d6c6617/genevetexumekofotido.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad41753abd---17587853133.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a7b5b148---29410189458.pdf
    • http://mackyz7automotive.com/js/upload/files/bovoretevuwalu.pdf
    • https://cargobull.cz/res/file/91014140453.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ebaac32f52eb2d0ce5b57fca31933e8d/bixepijegexerisejolobad.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e8349fadc---xizol.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/beragilupeboted.pdf
    • http://sosnovgeo.ru/userfiles/file/jijedukabomutopowa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hd+movies+link+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ee.bin
f53bc96e6ddc164c8f1efe3a6a415af800c8ccf4ce3b297d9915a5e58db0e879
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 17120 bytes
font_01_sfnt_off00010348.bin
743769f151cea67197c99a52b7e1e1ec5080cb344ec80c481eabfe038d33ffa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10652 bytes
font_02_sfnt_off00011ba0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes