Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57af5935537964f…

MALICIOUS

PDF

78.4 KB Created: 2021-05-04 20:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79689403e9b6e04afea799266e83ea47 SHA-1: 8f049e316a4d4ab1e78c605cd66043dd1a314f72 SHA-256: e57af5935537964fe062612082dce02ae56e302654c35c41f26efbb2f4506758
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6097oqtgf4fgtnps548655k0q/xisik.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c7db41f9---ragejuva.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607706d6699f7---19172755301.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e38116b93d04f42a98082dee86e8ffe2/resuwutopifonojob.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3aa0548096acf5556856bd061ed39708/51528193786.pdf
    • https://diaochue.vn/userfiles/file/navetokevelunid.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/24175b0bd9a753b361e2a810f7faad14/murasamebajasezirod.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdc5694d22b419f61c344693c17d55cf/20317511888.pdf
    • https://sasalidayanisma.org/uploads/file/gurerapizaluxafebiresikex.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/h3nrmnoaos1j4fliovq3e80e46/6966326401.pdf
    • http://talleresjpg.es/img/file/36164803876.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160784833c70ee---naroxezelumidowopujo.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2c049644---xekutojukifuxilewufa.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab0fd59fb---lurigusipugulav.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe83f2c7f---73006080945.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=momentum+equation+in+integral+form
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bc.bin
53f253219fa8df334f0922232cd0e75178e8eb3c7ce8916bccc03cb96292ad7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 5040 bytes
font_01_sfnt_off000107da.bin
427016aef6da8c9cf5d9d20fee91dde0f7a6d29d1facb46e3e5c1b06429a1602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 11112 bytes

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