Malicious PDF — malware analysis report

Static analysis result for SHA-256 721e5eefd5e83d3e…

MALICIOUS

PDF

101.3 KB Created: 2021-06-27 13:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 141754ef4a8d058208c8e3eb89c06788 SHA-1: 74e9f3e8dcceaab5db881b34da9dcd7b9dce79d4 SHA-256: 721e5eefd5e83d3e7ef75c22234fb90c8ee368b4ff992980263379c9391631c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. These links form a link farm designed to redirect users to potentially malicious content, as indicated by the ClamAV detection and ML classifier. The presence of embedded JavaScript suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ad221b26---58167987095.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/larusanuwemevavirasu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb92cbc623---pokovujabepago.pdfIn PDF document text
    • https://dineflon.com//files/10730688730.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/25733888406.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c68a8ca9---45111170403.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079191422f06---1580917547.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/e5sdobv26gddtcdo117nrit6pn/12399957044.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160765e3998ff5---46069301386.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/7142577109.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/jetavabikonibojagu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7b36341e68af9686e9c1cecbd43a2695/58263419285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6990ce592---valesijajawum.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ac0s1sdg0e2hnfum0bv3p0bj7u/94417551855.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lagijejup.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b587115eb---wusabibewumubetosa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/52u7k4lgpg0lmu3r5sr76037p5/ravumeduwugakodavamixega.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5f4b11780---20039427751.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d069ecc1260919fcff9724bb9c41a8e7/6073956980.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bb4e5aae---niwipitozugir.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210626205222_67ikvu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ba98dc45274afdf5082fdf866ee7ae39/poveja.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707208e1c85---96626697251.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/45995591169.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/83031234747.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/si6fopp7i6ttpnh97nca952em6/pebebivonavamamoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=assassin%27s+creed+odyssey+fully+upgraded+shipPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 18204 bytes
SHA-256: 4aab0db5adbd60c689cd72ff6283c87e65337e1a7c37aca0c86e8a3d30c2c82a
font_01_sfnt_off00015438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15438 11032 bytes
SHA-256: b44791a29f916a9737b3a43c50dbf40e85ca38781e5c67e2edcd4b1c9e0a21b9
font_02_sfnt_off00016da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1