Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9291d3c2dea1399…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5e0855d7c5c60e69bb5aa6d39c2bcce3 SHA-1: 9bd67fdca4fd4d43bac3391a12a51905fcc479f1 SHA-256: b9291d3c2dea13999667a6385cceeeb83ec8b1e2dcf520f4763bdf96d53c7522
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=mlb+the+show+20+android PDF link annotation
    • https://eledigitalpr.it/allegati/file/52774767521.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/59144488505.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613effd187860---68109023992.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/651910ace154befe2ddc36ef86a868a8/felipabotupot.pdfIn PDF document text
    • https://mattress-leader.com/media/geludotikekipovoxogupaxuw.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff196de4fd---bamobemovomotubapupelew.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091419163672.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03a407af3---14118198855.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/gurizufa.pdfIn PDF document text
    • http://adveotec.com/img/file/94921224813.pdfIn PDF document text
    • http://swhos.com/upload/files/60854734588.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fubesifugirifalulekogura.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/12768982414.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090417031817742425n0ga.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/pototomezugof.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f50b0e275---nigimurowifutarozibe.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/rufevurisolugimesimole.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/10444813174.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/72275823035.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614401160ed01---62532694157.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/81404747561.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_off0000c04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04D 18236 bytes
SHA-256: e3cdcfa37b2b448e9b70e54ffe46edc9f0635929e3fbd42053ee59f91e741748
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 10808 bytes
SHA-256: 7e97d805f1df0872bd5e63dee2f27e02d05884af84d391508d927b678c177b10

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