Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc693526372592c…

MALICIOUS

PDF

80.4 KB Created: 2021-06-28 11:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b31f39fab40eacb0cb0eedbf9956047f SHA-1: 8214103cf7f6e7d9317544a7c646eb0b408609b1 SHA-256: 3dc693526372592cd228424a4389053c424bf8b252e03781ebc2d19922697663
104 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 CMS uploads or disposable hosting, indicative of a link farm. The ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, possibly to download further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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://oniceh.ru/uplcv?utm_term=how+to+play+ps2+discs+on+ps3 PDF link annotation
    • http://akvatoria.by/UserFiles/files/43678717072.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/51939ebeac01d4036d1138d0c06d15f4/mimizu.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vesafop.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0f12ebdcf6776fcb58f23de1a424fcc3/jofavenikupupewifisovi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/voruwojeribadigo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/26380935613.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/18463292668.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160946fb052a60---nijexinenokuzejagesela.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160712f1f4a09e---97021797024.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/pamemowapapifabizades.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/vojojodew.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f166551ef754ce6f7682a9a51f3b0ccc/33851171214.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/pasokeji.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/fukufuvakezajalupajov.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/36372000661.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb2c96215---26645604417.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a46c7975e---30284931327.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/savororu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c22c5b0ac8303e49c3ff40c7c83df026/7704965340.pdfIn PDF document text
    • https://jagominum.com/contents//files/jesolujawa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d7f18882dc64ad7ac2bb68ece470733b/10136442.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a5ucs3mjglmet3l88uce2qvau1/golufukexaraxiwadosuz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/o02nj62ptee02du89o103vie80/58464545335.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fb0e0d159a6638784e2cad39fe09f423/34828083972.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a7cee7bc81e10862db9397950c9b89db/73561833465.pdfIn PDF document text
    • http://garderoba.sk/images/_file/727595848.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 10756 bytes
SHA-256: 0d093b1ec21ea1f9c748ad4db31b3bf7ff87247d91d83bab86d66926cef2f3dc
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16768 bytes
SHA-256: 35c2e695622a32f6b46f2af4d4f604d6923d3a2f2ce4573518d19f8d8219530f