Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ac4c75241e5def…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 01:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 955c6f7101595499ae1332f4b669d576 SHA-1: 436804906f817368e7abf405844736f329ccb3e4 SHA-256: 22ac4c75241e5def14e045f4c709acb6ff202b0e048c52ab56cae0e9dc976f65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=bip+messaging+voice+and+video+calling PDF link annotation
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/dozifebada.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/vivasasi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb14ed69c---68865532561.pdfIn PDF document text
    • http://reopen911.info/media/file/22519916383.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906142638.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/tuzutazop.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xutebufuxoxabutudavibukuv.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/nidajuxugoziv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161491cead6057---77092151638.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/25331232896.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161328b1139706---33446228917.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/powuxaximinipinukafit.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/73592290539.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/guxeriwetowogoruvafigu.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zigurezivak.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vifigure.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/36969459636.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/925cdcbd71b67e09b4c2b95593c07753/82961399070.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/12108644938.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/kivabevalaxew.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/tufageba.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 10780 bytes
SHA-256: 0f425461a6dd450f084896f59fa043263d7ff0e77b428ee996d900c3f6141a34
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16988 bytes
SHA-256: c4f246d25659f3c1617faddfb4e549f8a33658576bafd6809759b54245da9d1d
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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