Malicious PDF — malware analysis report

Static analysis result for SHA-256 385d5024b4a1230d…

MALICIOUS

PDF

117.2 KB Created: 2021-09-02 16:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3824fb5e7579cd54efa93c75ab4539fb SHA-1: 1dabe1ddf29ac5ae9574914f7dfd738b5ae71d9a SHA-256: 385d5024b4a1230d582a6fad3661cb915b951667c7adef48648c6a774dd9bed1
164 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=hauppauge+hd+pvr+2+user+manual PDF link annotation
    • http://stroisvias.ru/userfiles/file/fiwunubekotoditajuzanuza.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/11063674349.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7cbd92e02---bofeluzorebukuv.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uk5io1vlnmb5tn74jd19u0v3u2/bunuvurusonolosikuf.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/98261308076.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105292308246406.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/nusaje.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b823061a07---rozemuxetiximibupevog.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/61669556209.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c325db385a3efe617c4641bdaf645a62/razifijikanezowaga.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/atfif3ps9m104m0cnjgekbpgj4/2221007137.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/worexukowadilu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16103d87ccd239---85638204385.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/favovazenotawesi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/99238254279.pdfIn PDF document text
    • http://wohntraumgmbh.at/17447873864.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/zofobobitamo.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/dojotulo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/xonazokidim.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f09267a357943815dcf03b924ad2a53f/lizemoradu.pdfIn PDF document text
    • https://kueapem.com/contents//files/mafofivopuw.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/56791109001.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/edff52f37f80aac2c8cf41ac0df84e69/pizosexiv.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63156144463.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fikomogemugugexonin.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/a90de61dc9362ffbd4e56b1e31c078d8/75761729640.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fd77bd657308b37424c14b527c19c49d/batapele.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_off00016226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16226 19232 bytes
SHA-256: caeb2e0a10d15fb91fd42982516ca577f09f6bec08d4b44a114e7f967be0c1ba
font_01_sfnt_off00019495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACAC 10804 bytes
SHA-256: 33c1be6336b95b89d6e388f5f41ab25bbd2abc9063e7efedebc0f679e25f7173

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