Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d2c4ee359e8d71…

MALICIOUS

PDF

97.8 KB Created: 2021-07-16 08:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 442df79c422c25b54af1ecebfaa43b50 SHA-1: 88214674a3456d330cef5c030586317c777739a5 SHA-256: c9d2c4ee359e8d71ddaa7e96d829dba9e0250ce29a60dc3a468597c553512a0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a245dfcf7---dojivojob.pdf In PDF document text
    • https://smilepaper.tw/archive/upload/files/xefalijodoje.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871eddc136e---lolukaweb.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/56nif1inf66j2sk8e1vra8ckii/rujagewakajirexaradebipi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fljn90bud2b0ccfbs4pshqk1l5/pizoxo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ebb857679---litegatepagodawa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df6a064749---68307022706.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/61060247529.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/guvugol.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/komajebotenudasibu.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/88233261864.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db8a4a2ba---figugud.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d052d470d11---55335557016.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4de003ddd5---64454718479.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/laguxotija.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed271c224---guwosopibunujuxodiwixat.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qgpl7mcimr38jj80kqvfc4pqqk/jebamijuwevezuvor.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed15f06cd7---78192884886.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0jv7a0m38tfv0glr3le595iqum/58065126018.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38037624529.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/bexobukatadoj.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3612rrp8cktcm3b9iarakttutd/jaluwejafuwowi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/01obicfnid444ort1tonu4apd3/kisirenujokezil.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/34564928894.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7315e657---52154740795.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nerikipagozusananakel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+fly+a+plane+in+minecraftPDF 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_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 10664 bytes
SHA-256: f4de627572ad56429954534d29b6e4b3ff6e66c35e73d2508cf9174061e7f230
font_02_sfnt_off00014d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D57 17552 bytes
SHA-256: b3a994c757d6819387c8c437b7ce000d1d183688a2043433196d9c7dddab13f3

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