Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc24e5c3b1ce681…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 19:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dd53dadf98b3494598b257e95652ae5 SHA-1: f0e948b52cf59771ddd2ba1ebbf9b909e16e79ba SHA-256: 7dc24e5c3b1ce6810fb26fbfc2ceb1ecece8816690860ddc1a12c2c204572772
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of invoice-related keywords in the heuristics further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=plantilla+excel+recibo+alquiler+local+comercial PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42608f98c---xopisaponiruroper.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160be443adbc42---lamidederivapagawe.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79a578e46---vodopedinigofes.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/79856232180.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/65179223880.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lowejipotobafaf.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/kofeduf.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/xosalameta.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b27762c5708---nitokawudezezakugu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/vomokixerewamuzafimemikuz.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/80901575238.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ece6c9d75---suzurowizopodowopisuz.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/46060401507.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/91914574569.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b0f87ee5d009fc41740aec77c3a2a73/sarofuvote.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/bexaranaxuzipixoba.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/nokipumojuxexojisaven.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/nenaxadafizovuzujumed.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/25309841439.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/31785619437.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610094d59c1cc---10746174807.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6c6d914a---4206038692.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/lamivokixafuvizipumogunib.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/jipuziwigapapenuda.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/59736446842.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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 18108 bytes
SHA-256: 8f6124243d9f1030fa08a65000fb698735d19ce5884b22dc4bd0835ed9fba5d4
font_01_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 10712 bytes
SHA-256: 05838fdaf399aefda6e690a0c68e2f1842483ea484406d27e6d5ea3cb2dc194d

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