Malicious PDF — malware analysis report

Static analysis result for SHA-256 6832613c7d3280f3…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 04:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c34a38058ac29d7a7f2252528a239c9 SHA-1: d807f53f7fe82a63e5bfeae3766a2999207d0160 SHA-256: 6832613c7d3280f344be3f3dc2720792085d20e84f39a782fc5e16c4590552e3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The primary URL suggests a lure related to a book title, likely to entice users to download a malicious PDF. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://synerhu.ru/uplcv?utm_term=computer+network+a+top+down+approach+pdf PDF link annotation
    • https://alkalacarservice.com/public_html/userfiles/file/bukopipoj.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hh4ea3f4ona23130honnhnhno5/72178354618.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vimerefopatepatil.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/punuxufu.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/56823136510.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/62208198923.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160756ae5d1437---lisetonokemawunawegeg.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31e3552c83---dikuxibos.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf40d3cb7a---14702049780.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f1ba05c---motev.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/fekanidijabu.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/romaforixifog.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210629_180322.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/97270986061.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/55073488332.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a64708e3---xikomemabufefabi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/76019824500.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d04480a1---zepazeluduvivi.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820c646a35c---71157719358.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/lanugujaluwuj.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/226f9e86439ccf3013ddb87d775d7b69/7951261502.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/pokijubomub.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/poposolobogesax.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/zexobevovulejot.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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 18032 bytes
SHA-256: d0dcaaf82084eb7b8d42c86480be8392fcbc5c0dabc147cb086a788a710afb0a
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10888 bytes
SHA-256: 056f378708e8fa1f74f0977dd5dd91bd8b1b2b5b7bcf967ce0f3a942e264880b

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