Malicious PDF — malware analysis report

Static analysis result for SHA-256 872e63d144b673a3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 16:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61b205a704397b224905935d4a584f0c SHA-1: 3281d5d5723920c520b4fc6d0ad7d779e66abd92 SHA-256: 872e63d144b673a3880d45daee5dd7cef21c834ccf76043b162068c852d2d005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a spearphishing attachment to lure victims to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=drag+racer+v3+hacked PDF link annotation
    • http://self119.net/upload/userfiles/2021/09/files/210920021145.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161399413d6e3b---2712343611.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321af3322bb---77758721677.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd70baaf13---baxibiva.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a9d7f87b5a7feeace7d1fbf96e70eaee/jikevoj.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/bozanowetumunegakux.pdfIn PDF document text
    • http://computerdoki.hu/user/file/32552654214.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/67851741219.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/56943407192.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/10826373923.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/fuvofi.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/rizug.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/serekamemowedikun.pdfIn PDF document text
    • http://rinsacars.com/files/others/13603970018.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mgaal4glnmpfspkaiuea9nudh3/diziriwopofugod.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vevawapuwusomevoxokaw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tq4710knlu4j6f9cgo1im06dt7/nosijujejezawobagufan.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/milijuvifogedaredefaza.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/504924297.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/wifidonulod.pdfIn PDF document text
    • http://podarox.ru/public/files/95200727863.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/rabogekewaworekatiwo.pdfIn PDF document text
    • http://hanifeugur.com/image/files/rokenufijup.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10352 bytes
SHA-256: dd17a7f4430d4d2928c2e750482cf37ed2191a3390884d53125337a272dd7138
font_02_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 17652 bytes
SHA-256: b91c0b2b861855fffaeae6c02a814990e168ee6b6e1463ac8c8593651a6e2a04

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