Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f023a4a843b8e95…

MALICIOUS

PDF

99.2 KB Created: 2021-08-09 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 126cade587897d6461f3b5b26b4dec76 SHA-1: 7a7cab5fc4a6539a481712cc4a87dc9f246a1016 SHA-256: 4f023a4a843b8e95fd533041f709564b80c628fe400c0d257667fd998d0691c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=the+creative+habit+quotes PDF link annotation
    • https://ncsccalgary.com/userfiles/files/97350101986.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zebasiwopu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ver4p0dhi04asdmoh4kfdvc9/98632088764.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/26732088363.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/53675357428.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/62785706065.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/euf1ags6u8c1tpsrp9gp19qb3i/rodulasujukukupufuxovusim.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21e9b7c7b---77443404677.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/boxipobezotu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6dbb5a187---85827827443.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sukizulolelata.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bf7fa60d5---sokejagomisepajufasix.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949046564a4---mesizog.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/rawetudovu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/20855727577.pdfIn PDF document text
    • http://sns.hu/_user/file/kazojeketageg.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/dagesepirilisajuf.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/97896081537.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d2def0a4---40255446717.pdfIn PDF document text
    • http://piecco.eu/upload/files/jabenutenadifezefo.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/xubuz.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/89178097919.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/87245260271.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7e6f2c6fbbd09743407e3d0d8ada0bdb/setof.pdfIn PDF document text
    • http://asustainable.com/global/file/80618565081.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_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 17928 bytes
SHA-256: 02b5bf631fb65d5cff196ab4c18f600e60eea90c8c1edd3df48e198c5d969d93
font_02_sfnt_off000164e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E6 10592 bytes
SHA-256: 8c3f9116f8d4f5d1c9dae75c632e345b4fe83f52cbb490f045ae4a2757496c78

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