Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd25540e35ec28b7…

MALICIOUS

PDF

90.4 KB Created: 2021-06-25 16:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ab5922c1c9ed46b095a50455fd4f26a SHA-1: c27a6d9c06dd910bfd57786fac8e137dd5228bed SHA-256: cd25540e35ec28b7dfe66026494086279dbe96bee994434abe951a351e10f920
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, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096809ce80b5---nenipevatusobasi.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1e4bd2a8---rosigivemasoz.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bd18e275e505f1cccaa21c1d789f2262/57808843374.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/90206982241.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a570729cc---mizixo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/fasufujuwufivegesu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4098103c---45864425378.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/vujonivetagalagekagizo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8bb87634a3fab1b8b2a7d307fac62652/zuwujufakufonozovarugepan.pdfIn PDF document text
    • http://flomojapan.com/upload/files/ginavedopuposexite.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/72935751489.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/zowexenuvezowogukef.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7dd9cac6f03f08e6a6247b2b57a2d80d/xazebow.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608be86e63cfb---46572342560.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/79776101873.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/31305301322.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2cc7hjne0s7vnia7dadiho3nqs/19457153086.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/dasuzokolegub.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/96809025812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=need+you+herePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 17936 bytes
SHA-256: 8bef7135e818cd4b6525263c91a8e21712116cda00be27a9fa95b0762bf5245b
font_01_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 16820 bytes
SHA-256: 221a6e0493dc85a55a572570aa63f8a3ae4c3839e530420ea358cbecec43105b
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 9868 bytes
SHA-256: a560846f9f50900795e52f3b1229a974738ecfe6f44498f66fad1903004e09d4
font_03_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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