Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bc66930abf85d7…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 13:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 045dd2323f161a81b8e8271fc9687d4a SHA-1: 5312e934630dcf6b425a7d1fbd2163b6763d8154 SHA-256: 95bc66930abf85d7a648ef9423aa04d5d66227f2c59ecaa74abfeb5d61851649
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=smtp+rcpt+to
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063830e2d5b071cc33062fcf56ad8f12/sibaf.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a2cd0b80---73592523227.pdf
    • http://aimic.com/userfiles/file/61404591010.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160834c50a253d---vepuregogafivubifenugugu.pdf
    • http://angelescare.com/userfiles/file/43721903799.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jutf9iq9psf0elu5e9gb3s5e74/kipizisi.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608916443580f---50436127801.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24b3cf59d---kabisikokowesu.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096330317296---josifuzoxirewafidesev.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c305b21a---38281169136.pdf
    • http://aircond.md/upload_fck/file/dubajunatanomulejodipu.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ace7edb8261248a78ed4c1e23b40236c/xagilez.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e03119e24---xofiw.pdf
    • http://weifong.tw/fckimages/file/74812690612.pdf
    • https://gelblighting.com/userfiles/files/dawezadafumumekipekufati.pdf
    • http://asja-doll.ru/userfiles/file/medisoja.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dibabhuaumaltt4bqdo6o993i3/kutajuxemexa.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/1nhes81s54ihf1d2t4rosfndv2/94420747855.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9ed3f742---visujoluxafametirilip.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d38b0a23a1879778d1ec718fba984902/nemibo.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d4af81b3b0139c3532c0540f5544b372/pataj.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3o69q2flttfpp8hqdrgbipd96j/48299233217.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dddb7e75d---vutuzujipirebovola.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/63506130855.pdf
    • http://m2m2design.com/userfiles/17017064864.pdf
    • http://kirilmazbardak.com/userfiles/file/subumisaselaraxazamo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e0.bin
8c3714613b6a56a1cf21682592ec6572381897d1f1b5d7b2c994df3f2b9227d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 9904 bytes
font_01_sfnt_off00011eb5.bin
938e991c6fff2014952c548760768e8eb367c7819ace0b0c22fe9aee0834334d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 17520 bytes
font_02_sfnt_off00014cb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB6 16792 bytes

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