Malicious PDF — malware analysis report

Static analysis result for SHA-256 a603484b797e16f0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 23:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 098c121b8ce236c07d1aa3a32faa4557 SHA-1: b94065cfb7857c61d4df7c049f93de4715aafd89 SHA-256: a603484b797e16f09ec83788b424a03aac8f61aea266772821974e5960e27fe4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on potentially compromised CMS uploads and disposable domains. The embedded URLs likely lead to phishing sites or further malware downloads, aiming to exploit users who click on them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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.ufolep-69.com/contenus/files/69670441855.pdf
    • http://happinessgown.com/upload/users/files/segonazowiz.pdf
    • http://alemotta.com/resources/original/file/48701789268.pdf
    • http://greensketch.in/userfiles/file/99808716801.pdf
    • https://haidangpc.com/contents/files/josavokozarisas.pdf
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/wamegafonixoxof.pdf
    • http://banghetretunhien.com/media/ftp/file/gutidevikamemebenu.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/64224459342.pdf
    • http://yongchengtech.com/uploads/files/202109130903261419.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dedb7bbf4---84712833046.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a898e96dd5272aa5187f8893d129844e/42000213353.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rozusurevikopibesolevures.pdf
    • https://naves.cz/res/file/pavuto.pdf
    • https://meritumptt.pl/dokumenty/file/lofufibovuwalejisixog.pdf
    • https://accuratesearch.com/userfiles/file/12011799612.pdf
    • https://paklya.su/design/img/upload/file/8291852759.pdf
    • http://hospitalityroyal.com/upload_files/file/lenajotumuzuverukapugegu.pdf
    • http://konstruktor33.ru/app/webroot/files/files/51687499143.pdf
    • http://eapver.com/upload/ckimg/files/202109170751351284.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c691445f93---41567580657.pdf
    • https://insolite.lu/img/userfiles/files/bogota.pdf
    • http://mamtomchabahai.com/uploads/files/files/xuxiputin.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/47419703149.pdf
    • http://nuovojob.com/userfiles/files/42666668557.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+desactivar+safe+mode+android
    • 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_off0000dbc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
font_01_sfnt_off0000f3dd.bin
98d0c6c4866ce4c870b04f197ee50548ba3f7a7e7db9c34abecf0f0984f58f68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10688 bytes
font_02_sfnt_off00010c6e.bin
e23dff8a871ae98d050c437f1959bad017e6e9057b3d882ab1c22684087c7ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 17876 bytes