Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d19003f22becdc…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 16:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fccb1e32b88b4ac2520a2aaac54b5e94 SHA-1: d021fe26f1df6a27b264ddeeaa0d03f923f2f0cc SHA-256: 23d19003f22becdc09acb1d2b1380c595b934f8d02f7024b9a9bd5e05136da86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://coretry.ru/uplcv?utm_term=sri+lanka+calendar+2018+with+holidays+pdf PDF link annotation
    • https://z87992961.com/upload/files/20210807174956.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fefikebomet.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa67094a---wevopogug.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c120925e1e9---pesoxa.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/32315436807.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r1s68mpmkft7pqm0hdorb5qqol/30780275730.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429184216163.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/9621598863.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/45988304890.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/81676189272.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073db9a4cea3---89895818233.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075afe3a288a---73373758917.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/94580240612.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/427ju6f1jeom2ent4vf309q5v1/xusafelesawavoxobonodi.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/47931948602.pdfIn PDF document text
    • http://jonellchem.com/upload/files/91405770438.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/dovexope.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/bureparewedoleluparoniz.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133295a9b627---xojesega.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/mepomonetimuruzilewoj.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0eb15c0ddde547ab02494a219c53751/65813757871.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd085cc48c---kirefepavumuvorupizelevo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8c8214df---77590688401.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/fubizunavi.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/rewanidiwefemezorolowuva.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6777ce262294897bfa53d7f45426e805/nusobobunajugi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/pumepexubo.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_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 11588 bytes
SHA-256: 13081cdffe032791f38cd566250bddf4358a3698a5ece59398da28a187da2bcf
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 17872 bytes
SHA-256: 6edc583c72405988e28c2307f91eea0d8d502e59eb8b37a2e40b9de329fcd017
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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