Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdfad2c349449cc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 19:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4677fb49ecb006e12f9cb6eeda970ba SHA-1: 2045cfcbfd5ee10592629a9a854d1adc565c3ccc SHA-256: dcdfad2c349449ccee9ea2fd394d5c03c17a82fdd0d771ec6bf48edb192cf46f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to redirect users to malicious content. The presence of external URIs and a link farm structure suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=vr+games+ios PDF link annotation
    • https://madspot.dk/ckfinder/userfiles/files/vapigoraninufekavobir.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14093958810.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/kufoligijamibuz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614669f848a09---netarape.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/32612556591.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/molojagubamob.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/92805317753.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/xidusaxigorosaviko.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/33295590212.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161468e7a4b1ea---18870617739.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/62dcer8svd0uu1lp5n3tr36gks/femusi.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0f765ba67b2fee3a2db8bda8f0e529c/pogozaporaniv.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/zifujagifawon.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/kuxixeborowupabo.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/43926682914.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16130c911da304---27663819930.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/71688723840.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/77342214195.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/libekazozowuj.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/kepedenavufawez.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/55303752988.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b4u3l6q2usfoa2ri0leps6c8bo/8159144963.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/32372333581.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/xugujasoritufebog.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/42953884772.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/97028036857.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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 17344 bytes
SHA-256: 50c9449ce5b66d8ecde355de36601efc68aa1047e3d91f46c3818c3aef1e9e8f
font_02_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 10172 bytes
SHA-256: ff81833141af2bad6a3d21baabf0ded04381dfa521b42606232aa425c9b4696b