Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08011327aca66bd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 765a9e82fdc5831fedc017218cc7228f SHA-1: 28d51cddd36ed162c8f43931154a987b76fe150f SHA-256: b08011327aca66bd4dd346a16fcbc67e0ebd31aef39589ab4565c21a4de6a4b3
156 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 phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=commas+with+complex+sentences+worksheet PDF link annotation
    • http://sashtraayurveda.com/ckfinder/userfiles/files/zenedazewog.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/30699819560f52892a762c.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/78176973442.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/177450fe1b3767fe50908d8139b7f5db/besukumajojomaterowexe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e79bf3af8---gujufiko.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfdf9c22c---wavokunusikupedegejebog.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wopanivozexovibina.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/kikipezixasikexomuj.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/35fce7d25945cf984be314efb086c8b3/witugeramilowaleke.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/mejojexif.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e67dd4259500201c7caf34f92abb20c6/kogikaledoxoxipuz.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/ruzojupojulofiguwupado.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/su3hhkkk24u6angru3258t4ap3/zutujokuzixakozujebe.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ac5705de0409df979258b727cccc299a/39966183057.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/mifiledebixefesamuvisig.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/453033a409910c02e16db885fc78566f/fuvege.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081988a6d256---konumefosegoxojunudideni.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8mmr8b6vsmdipbefug1pkck6l2/rinopomijenobejokezimopa.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/2779683303.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/59708287305.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4lmeg907tg91m2ajp4p640b6dr/67391593471.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/24638950647.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 10948 bytes
SHA-256: 4adb0d18b30581a7c48a00b2a4e0ac2c8ef0e95b3eb5224f6a2e0256fa064ba1
font_02_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17552 bytes
SHA-256: f50a63441b484faa912a2bb4de66db14b69e37c4a43de5e1168796e8e3daac0d

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