Malicious PDF — malware analysis report

Static analysis result for SHA-256 95624d047d1aba3d…

MALICIOUS

PDF

142.9 KB Created: 2021-07-01 21:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c2dced4b0d898087c10abf94b40b7af SHA-1: 391b3957a7ea09e4b04d93cd271cb798fadffcd4 SHA-256: 95624d047d1aba3dfdce3274eafdf82e2e4be0a7b249df230a5dc8b12a050c9a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://ketchas.ru/uplcv?utm_term=raunchy+would+you+rathers PDF link annotation
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/u23vatb5orbnesncc8mmam8g03/80536689512.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/fegapemubujobube.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ca3dee05---xamof.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6c92aefe78bf07691d14c5b9fc430d74/14488239943.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jazomawaretefuni.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b05e2c26964100f3406e0c3e1477139e/nigimumonizakuxijo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0986455cc---mabawawowikesemelevopepe.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a50af1a1f---fukiposizuvozex.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfdcqejhtgpro8tj1jfm3jkl90/purajemekevulugerutenekos.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9f57926---radadavazepewekatera.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e495c505---52092597480.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/22783901671.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c148326c071---75072822249.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fqm54jbtjjhq4vqfbtk021u9b7/xenejudu.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/87134502481.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219a0ad331---tomefadajuxoxutobinojuf.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/61520182129.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073241bb6fc6---91034024422.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/vupunobigotonopawanabev.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qe1n7cagdulv79399fkjr43hha/82340422360.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92281179229.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/dikojijudijinemulukuna.pdfIn PDF document text
    • https://retta-bg.com/userfiles/mibopaziwasorasutekejux.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a168c45d3eb---18735529463.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/vedakumil.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080184e44aad---fipivakudiranakebalage.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/427397140828311b70b8edb5184a6267/metimopopixi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585e423a19---36946711297.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_off0001d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E908 10720 bytes
SHA-256: 8decdc1feba52f0956e6088707ad6310e5591f211880934e7a3204fc31afb49d
font_02_sfnt_off000201b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201B9 16996 bytes
SHA-256: 0a0767a3af44a455aab3fdba8e6ffcc6e67cd2d4e0b3af7f58542e47d5e8ef85

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