Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff43bdb8ad1118f…

MALICIOUS

PDF

95.6 KB Created: 2021-08-02 21:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb9c8995cf38051960e666a7f69d8574 SHA-1: a3513130f8f580e316055335a202b3ea3a7c2215 SHA-256: 4ff43bdb8ad1118f59d31c89026ff47f32be450493d2a6cc766a03e1c5801990
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier. It employs a social engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware delivery. The document contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it is part of a link farm designed to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65af7eaa8---dudovekil.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607580706450c---linumabikajevekati.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11616aa0d4---7654149299.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd8d5a418---dubekomukipirop.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021073104160973499.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/73150770004.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9588f2945c---57569103431.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c42f679e96ee52b5217dbb0ac7c1e3b6/juruvumijetesenenununexor.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nekuwibe.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ed35815e51019bc66c51e8356c2bffff/8134979703.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xakiv.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098197b59637---vapirikima.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jexovodenaresufupop.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/83684446992.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7659e5f9c---fosejuj.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/37fae5593e6cab2436f4efcea00e6ed2/79831495428.pdfIn PDF document text
    • https://digireg.pl/upload/63874847405.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/847677aee816a0dbb2cb34e435fdcdb8/36409273742.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/97125020542.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/85962281483.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081b83a247bb---59078567702.pdfIn PDF document text
    • http://candientuvibra.com/images/file/muzupirezuvusofimaxuvu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/39e3c096c7b1fcb56eb6c84628b53071/dosisijoranejupokij.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/85635668293.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xekesulatakodezimadarijo.pdfIn PDF document text
    • https://discord.gIn PDF document text
    • http://shellshockers.ioIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shell+shockers+hacks+2021PDF 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_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 20756 bytes
SHA-256: 85d5f9d97c1a164577debd385d37c6a0be9dfcb9a2d5aeb2acf358b21807ddcc
font_02_sfnt_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 10492 bytes
SHA-256: ef4c90e551a073268110e04841f68e388e83d40a635deee55199e98f7216bd5f

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