Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebffc94109ee8e31…

MALICIOUS

PDF

78.2 KB Created: 2021-08-21 14:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 994f38e746982912f0477810b92fa978 SHA-1: fb916367c687d1fb219ca88ee9dee5d22d9b114a SHA-256: ebffc94109ee8e31589a2a2c63ccbdcc19441248bc25984d1b5828ff6a19768f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=unblocked+games+balloon+tower+defense+4+hacked PDF link annotation
    • http://aprt1day.ru/file/wuxakeb.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f187159f---bafuk.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701fc8bed81---xotovatuzakopebawolurabak.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/18702551283.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/62423716763.pdfIn PDF document text
    • http://matras-devison.com/upload/file/61675762145.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1noe6pei37m13dbspf8ecria72/wesufitovetef.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160816229a0678---45018218950.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rinodovaxu.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/31028392411.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/xobinejupetopef.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/57061650109.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/5826571493.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bomozizesafulaja.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765cfc060e9---57386684991.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/18828892087.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/1985918106.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sgqnnp93hisen9cifp7fri10ev/93870311451.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754da33393f---palavekomujabi.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/42078174583.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/omsu2pp4dt671p4lhe4i8m5n08/52028400208.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100d923aeb4e---wiranurodarakiseguzinuba.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/aqbk5tk4fqtu7njsckv7r1hgo8/31907231392.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4da9b5524c56eee67a31e54eda95cd7a/95809655980.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/39186494646.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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 11232 bytes
SHA-256: 676703e24354543bdd86a6098a0c794f3d471e828ed359da54c8683c6d0c56d4
font_01_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 16232 bytes
SHA-256: 7f2e42a3ee1a354eb3d8299936001480fcb5e641ab41601079b1e648b69796f5

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