Malicious PDF — malware analysis report

Static analysis result for SHA-256 f407e9db08e7351d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 22:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02c51505d5378fe1f5994bdbbde78488 SHA-1: 10ef5718a30ca21912a8101f60b689dbb548f592 SHA-256: f407e9db08e7351ddbebfe02c46ec6e95974063fa27f326812888b891e415fad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The primary attack pattern involves directing users to these potentially malicious URLs, which could lead to phishing attempts or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a1p7jkcr3tr10t6omm8ab0ju2o/jalotufujelojolufipeson.pdf In PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b4352ab5a8e6d70e21d071496332725d/78874078774.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/86015304825.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc340d5b5c1---lusunuduk.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6596d4171132e3633a0562201b0f39c6/53225970952.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b3fec17e5af27109ca733037d7b8e38a/83868070952.pdfIn PDF document text
    • https://tigaintan.com/contents//files/kosira.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/zixopowopovapilapi.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopibuvebigisijinakon.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09e4b66ab---63612579578.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/20979253020.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c78004876---99878193876.pdfIn PDF document text
    • http://identik.hu/editor_up/90085955761.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/sawuliwuxujubisenufanap.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bbed29d0iu2nt99tp2ib50aje0/vadobe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ui4fifl6pbmm43n27brp655j83/nimenemerovekuporopezupi.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/wajiter.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/98516324756.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c09ca68e4dc9da3bc7c3631d31bcf768/1377026328.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/96812264838.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rujejenusixakef.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/idmef1jgsdbtq6lgo4b2rqpnc1/sofanifevu.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/posazeduxo.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/poturinujutasifejego.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/4410263152.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b79bc1483be0a9f007034b4fe1d2240e/favobanetuwegape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wagner+airless+paint+sprayer+model+1700+manualPDF 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_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 17676 bytes
SHA-256: 8a6b1e5b0fcb045433bcc82847e1aee7cda6ddee9d467b5f428e53784fbf4d8c
font_01_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 11164 bytes
SHA-256: d0902e1a1e651e18f65747774c5e421e9f76fa58d81598f187510e7be2a0def8

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