Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa8a6a0ebdd2c79…

MALICIOUS

PDF

100.2 KB Created: 2021-07-15 09:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cce2bb8835b2a0d46a4c9d716c300162 SHA-1: 8a2c2ee6a5b59850f190b80d9cccafeaf58e6cbf SHA-256: daa8a6a0ebdd2c795ddd9836d28a529d474b8c9cb9be251c9eac98e6d4348ac7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9323

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 http://www.cddfct.com/up_files/file/22512093223.pdf In PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/laboma.pdfIn PDF document text
    • http://jkohut.pl/file/35022727247.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/76578747678.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1fb9edf0i6o67kk41lfqisvav2/fipevow.pdfIn PDF document text
    • https://argumentua.com/i/file/22759178130.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8d75a2fd---5988851278.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceac6942e75---fozofogajoziban.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/77426327305.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/20123824925.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cd0de0972f91d70e44d6891943c40577/64757792426.pdfIn PDF document text
    • https://hssanesteban.cl/files/14450440849.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fln12kifs5bqvlg4flm3tlso26/gegisavuzezosidapeku.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd90dd49---mirufodimeramaninuxep.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cira82molh4p1ia5q54knki271/buvakulirezatet.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/53568343308.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd30929928---luwumamofumiwa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a169d32b30d---tuguv.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a72b23f2---77692702010.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/76146369551.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/bubamosewerukakabupis.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/21242721136.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nipemutozadob.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/45968236760.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/poxalusotate.pdfIn PDF document text
    • http://greenbrier101.com/userimages/fegukoramakuvag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chastened+in+a+sentencePDF 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_005_off00014ea2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EA2 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 22988 bytes
SHA-256: 4748e864f81f77ebe64996a15d0fddd7085ad743373a61375de4a0ac7cd9c98f
font_02_sfnt_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C44 10232 bytes
SHA-256: acd5aa485c364d24a9190dab8c77907308237fb53cc80ab48acb02740e0af965

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