Malicious PDF — malware analysis report

Static analysis result for SHA-256 15982b0f76b4985f…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 19:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8519afcb2ea0ce960fe1d0268f9b5a9b SHA-1: 6a344a73bf77078d1f3b66efa945ebb48e6195b4 SHA-256: 15982b0f76b4985f0a2d4f113b9f59262353e7f61ec667937734f40c891eb290
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URL analysis point to a deceptive link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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 http://ipllaser.in/uploads/mibadujekux.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17f99b096---ridefekametora.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/voxosova.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/37594206386.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ai8jq3k3f0et2cehmgs237ou97/36264506818.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5f16813aa6007346988e87674baa9960/zajavetalirilepaxebobil.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nv5vlqagp5u30qnvbfsabl3rau/31617985892.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/losisejapizomurewufudoser.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/86275884097.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/kinuvatuguzobadimizetuxi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/99sb3eq4imo9ptkate11ajea7r/lotunapevexupovirexituroz.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/227845981.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/122012811eef72eaf668ea7bdc8092bf/65497045026.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/dudonubijexigafarijafe.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7089b577e8---tezosiwenezawilebutor.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6b3v2k8q6ga6e04h91i1lgu0h4/gukiposivoweboxovilo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qmocmm3iqs5hgiuub44n5a2h57/mivekijog.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7948b11adbb208cd0911c89f9b556e74/62360209686.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nodogijib.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6sdu7a5da5pkvnjse47tbdmlf0/84883756134.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf5d5e8c0---25454175635.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/43012362930.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867766728b---40203364423.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096587381730---tabotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=meaning+of+ologistPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f598.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF598 19100 bytes
SHA-256: 00b9de5ffbd65bcedbd9dd3068102f4a4236e936613c880a517c06e7a59089c3
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 23928 bytes
SHA-256: 9e2cf6ad9f773baa6d11291bca12821e93e8597c5f452a73904e61464bf8a6c9
font_02_sfnt_off00014ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF7 3792 bytes
SHA-256: 3db5cc016c8f2fef4b515f0abe29e3c8a802b1a6acf7b0018b8ab4b10c36951c
font_03_sfnt_off00015e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E72 10280 bytes
SHA-256: 91e822eaa83a984a5abe2746085a6179ffb928905803481ec5a42ff9663efce3
font_04_sfnt_off000175ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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