Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bc3a2ed2cbd0de…

MALICIOUS

PDF

102.5 KB Created: 2021-09-18 16:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0147448eba6e6708263cd72438b5bcf SHA-1: f650b2bce6652f6ba2646bcc777a9ffe50b88f59 SHA-256: a3bc3a2ed2cbd0dec645807fbcfa1f50ae07561f3ea57e77b8b33b6765af40d7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads on disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to appear as legitimate downloads but serve as a link farm for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e5d6db8fa7f47c38b0c199b2fa628e35/limowiborumazir.pdf In PDF document text
    • https://ebooksweb.net/files/file/boroniza.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/tokufogilobisixuwuworejok.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ddevo37uu7ikurv5ela76kbci0/sotatutaxewuwe.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4253e7135d614dacc6731b7c4992e5f9/judezovinowa.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/97435986580.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/farixusovekanogipe.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/vofuxog.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/67717317827.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/71549530785.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/99833759950.pdfIn PDF document text
    • http://liluby.com/upload/file/nedafememulaji.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/guxosatosenuwev.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/71974009469.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece6449117---waturoliriwata.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/i12j3cbn7n4gtqc79buc042t3l/wumatosexasonokobirajajum.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/df3545e49bbd7726748e55882976d281/zasexugividabugov.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lifobimax.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/10512126748.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111453045466.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/31241235699.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/pazedemuwivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=game+of+thrones+comics+pdfPDF 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_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D8 19184 bytes
SHA-256: 077984f9a42f3f9dc2153f6d899848355d37128e61e56bb301eee0137dda46bc
font_02_sfnt_off00017398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17398 10876 bytes
SHA-256: 841817b729d4abefee50d5094d34e7091b71ef9fcb383f0b4870add9b5977085

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