Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdd3863e690f99c…

MALICIOUS

PDF

75.6 KB Created: 2021-06-18 20:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9965321cc44d283a6ebb9e6104911d SHA-1: e8a3c756d8f472347c1b6cedfa8d93ee2dab5cc2 SHA-256: 8fdd3863e690f99cc537ed03c072fa3b6f35df3a5ecc875a9f630bcaf7a61b2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a434b3c6c62---vaxedikerolelorukagolix.pdf
    • https://beautyyaurient.com/editor_upload/file/sofagonadokuzi.pdf
    • http://sanarina.de/ckfinder/userfiles/files/32805707373.pdf
    • https://audit-advisers.com/userfiles/file/41669106587.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/36634f57dc2c530e5e537e8382e7e945/16998953414.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/m13be9uj018p7aiqti0o3eugf2/gexasosaritobelipasupa.pdf
    • http://angelcabrera.com/FCKfiles/file/porogalojesotezure.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2a9625be---pujapixaduked.pdf
    • http://bafiti.com/sklep/userfiles/file/puwewovigi.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pub8t9pim78mntfeirs4baor10/56113303154.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7042a004fd8c36ce06df4d58ffdb9cb1/24717663028.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6ebf4765ec812414bc145f0bea56d997/vopokebuwog.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e793a0af2eec2c5540df4c0a906e4ee3/36283578130.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1af9a1b408cbfd4503c6006dea1f9b06/5116689413.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vishnu+sahasranamam+names+for+baby+boy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2d.bin
27efa191ed05a89790d34fa95b683bdcd597fc6548de134865e4963153615174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5184 bytes
font_01_sfnt_off0000fbb2.bin
1b1c1c16e1a0d5f1fb52c07cd3935d4a46b564737cf1082bfcbb8583504fc64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11036 bytes

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