Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dd314cfb03031c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 00:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb00893878732a1ed05380532cd55d02 SHA-1: 7fe5892f9fa5f39577e417476f55bcad99654063 SHA-256: f8dd314cfb03031c12278db348cbcd94f3b7b7a367f2b8055fcad5010d63cf13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=format+of+experience+certificate+pdf PDF link annotation
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/89986346853.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/71686601218.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/vegisuvopanimobibudeloja.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8be4f67f---27380802901.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/kerurome.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffef821a12---fazaniwixefotutiwa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/87a88ddr8psg0k885ctvpib9bv/43070565827.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075871faa234---bemiwodapavosagijun.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0v2gjj2t59644tfiqjd4bslls7/jimepaxit.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/12095216635.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454204be---tupivikoxito.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/67575040166.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/47141ed20987e9071a5f0130080272df/zixijedefujunawitepav.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6131810964.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/82471765293.pdfIn PDF document text
    • http://midel.me/userfiles/file/worofewasexowu.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xelimubumiviwivesen.pdfIn PDF document text
    • http://riph.pl/userfiles/file/wazopunabafuzituze.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16120514ce222a---59887565046.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/73407375502.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/eb5c3282ab52889aed469649911c3b2c/92052310339.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/46185d2f7070c46ea30b2fbe20b94234/fokatuxedodilagifuvaw.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/darutajosotogerijodubad.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fad1b464261---11941372749.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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 16508 bytes
SHA-256: d98ec9f496633eaaba39022682d756dc2d319bd63305b5c9831e01da56a6d56f
font_01_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 10648 bytes
SHA-256: b7680cc36d3bf2b15e83a29a2a72e3696e387614bbeb705610a9901ebfe6b2bb
font_02_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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