Malicious PDF — malware analysis report

Static analysis result for SHA-256 2800d6d04249d76a…

MALICIOUS

PDF

84.7 KB Created: 2021-08-02 11:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ebbe102cd1b1ba36d093fddaceb90109 SHA-1: 7e530c152d16141395f6ec6efdab7db7b54c9082 SHA-256: 2800d6d04249d76a4fbc5b6894aa83ea059bf852d09746124c7b74db9502e82e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its classification as malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=how+to+use+samsung+tv+service+mode PDF link annotation
    • http://biemmecommerciale.eu/userfiles/files/tawanipagokujepolavomow.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a42c655932ca9883e0b501a501dfe4fa/34853487594.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/93756494164.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210601235816.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930dc6dd84e---37201214705.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338c9cd394---14207906837.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/46294454214.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3o5hu0vrgpevphcke4og2r2hrl/jojanuxutixedasef.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ae916fc22---saxoruzenelepaxadeki.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sjru5e66f2aihfri5gsi0rjnmt/xitubotolor.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/77717690522.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d93e150391094eb8c7a047614940e273/88722480640.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gedigibovupijotujijezular.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lokukulunirudiwo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/rekoraxetew.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jiraxivoxaxirol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb7733b5b---34683504363.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/38b1ac9c91e57a99e4384d263c8e5ba6/56333789605.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ae0d56a7---suwufifujotudejele.pdfIn PDF document text
    • https://tepihtrava.rs//files/zoputubenoletupisiseles.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72231995869.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/gumosorusi.pdfIn PDF document text
    • http://bakoca.hu/files/file/34812871924.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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10912 bytes
SHA-256: e09383f5b5b52f70145d479fd46828e3d3703c7c6488df1f73b9d6de3c31704e
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 17256 bytes
SHA-256: 6da44094d5d8217790f24739656b81265653b4a98b7a8e8ab33b3a37876b0337
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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