Malicious PDF — malware analysis report

Static analysis result for SHA-256 913a7b6df41f73b5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 09:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40e9922ad63f87eeeab556c6b602fdf5 SHA-1: db048dead25ccb5e9d34c948cbee40a4681360a3 SHA-256: 913a7b6df41f73b5a71b104f78de3c9d501f52a66e9bee088837668f5bb6ff45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pistant.ru/uplcv?utm_term=spoken+english+telephone+conversation+pdf PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710a7201e---miwumugoruguvej.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/luxuxopisulovibegilu.pdfIn PDF document text
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/73641729868.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/dikisimowuxalevunesu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/694abd0bbf7103603e68689f6bf2079e/zevazipenobufawibidas.pdfIn PDF document text
    • http://fkhd.cz/data/img/koxilarosewitagidesix.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/34323840902.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/gebopefibuxifozusevefa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9ea82b53---kanuxowax.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/wekoxabebovowawonisi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3d9ca881---ruwapirixob.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/rowutifow.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d9402a05---1159009796.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d84bce622c25390ee7b6bb337f95ea00/91955102963.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/82424573611.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/61dvq9aqouaq8vnr0pvqb13o40/wurudezo.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/posujaxuxezepobomudob.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/desulurulov.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/feb24cab647cc950471e1afff9bb50fb/20486069877.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd86bd12d7---81344170630.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/6677595164.pdfIn PDF document text
    • 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_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 17664 bytes
SHA-256: 9a69d6e337bb75aa7710be44ca4e09bc599e8de808607def9f4d9c8071948207
font_01_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 11132 bytes
SHA-256: c3e654de23b1e169cb1cdeccef441772144cd56dfbdd253f0736d91899653b4a
font_02_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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