Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cda5184092917b8…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 751800a235512517385a72136592aad0 SHA-1: e0dc0cccbf460a6a4bb8000617cd1a67a65aefbf SHA-256: 8cda5184092917b8ddee53f237832f005b13767f87b38c8c466c089bbc3b7740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. These links likely serve as a distribution mechanism for further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The structure suggests a phishing or malware distribution campaign leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://misosmile.com/upload/editor/files/bobupa.pdf In PDF document text
    • https://bcbc3399.com/upload/files/27900593117.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/djkivl5u286cr22gakf9v9p83f/wuwagapesivemibedi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe65dafd57---ganulome.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1580cb243---75913292976.pdfIn PDF document text
    • https://hoavily.com/uploads/files/sokepararilebotur.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/9690e9c86cf632758b27db5f63ad63be/81565256619.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/97925137064.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/botumoxefon.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/puguwonokakesoj.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/kevafogisikiju.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0b1796b6---9175191687.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/rexofugojon.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/689e96356cb61a023efbab45ed2f3859/94410607589.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vazudila.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/57595074108.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/zetidotuxapisi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/dd3daf4b761f886ebc825d2e6345ebf1/70241449805.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24e726672---76129501700.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gikimujokijebafejoj.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/61036566502.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908f0251836---30784581360.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/71055967103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+enchanted+armour+in+minecraftPDF link annotation
    • 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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 18132 bytes
SHA-256: e870472cde23595248d08c30c6630af1824592edd7b6d8a59eccd10831b1efe9
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 10848 bytes
SHA-256: 1c141538f678df747973aebfe629001e06fe3f43e1ddeacb7acfa2c14d3ea2ac
font_02_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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