Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d5581b3d7629c6…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 02:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbfe1dc9c17062809a12d7986f3e5b21 SHA-1: 8665fc66f5bab0b464a66318b01606ef56874458 SHA-256: 59d5581b3d7629c6abca9058ea6bc3791f279cf8b0c3a9c7cc250108ddb6205b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=slaughter+will+trent PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c004c6e8268---gejezokaboko.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/zimipetizobimimov.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/runetikoxarawuzapanariduf.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/885b15d76306c9384410248dd225a10d/lugipefubobif.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e949165a---841728699.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/velizukizusorotejubiroju.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/fudamokekelewodefarinujol.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb42a0f591---fosifurasovopapif.pdfIn PDF document text
    • http://myphamasia.net/upload/files/30734474141.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/vefeloxigalowox.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b285ff306f9---marepatup.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a03443bd93e---51525812145.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/gexinexen.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b99b4e835---dolasi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c969c046f8cb72b5bc73a337fac75dbd/novitoduxe.pdfIn PDF document text
    • https://area5srl.it/file/kovojovod.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2ad2e5da---pekuzeromilobal.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zagex.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/wugidibok.pdfIn PDF document text
    • http://cssh.es/img/file/1699610629.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210813232506.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/27437882484.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/1414246152.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb25d5606---85169398976.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/88afe8f906a693547003f6bd208e652d/pavizimavejojaredafakad.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_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10360 bytes
SHA-256: f5aac931b11661bb27ec37d50f14ab0fa78cde806fda47846065ad66f18434f5
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16324 bytes
SHA-256: bc8897944da0825ccddb09315323c711808207e82f39eb0a4d629f9ba1aa2d7a
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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