Malicious PDF — malware analysis report

Static analysis result for SHA-256 d558c500026af4a9…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 04:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8250c76db4d7521fb596e5e4738ca77d SHA-1: b3067cf02f1483a9cd344e4ee0edc643cee40bb3 SHA-256: d558c500026af4a905b9409103ddb7354090bd1a87e83c897821e36cd0728da9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm designed to redirect users to these potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c582ad25120---63674646828.pdf In PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/makemiwimowofavatomikap.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5db7011b30cb14759e55053a1c78eb4c/gojimo.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/jefukor.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/mujowezeposuserebo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d97db3ef4c0dfc3a63b2db16aff70ee3/37698575908.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/498cb23d869349370623ee0289e6a594/nazapevelij.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/jixologipib.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/40965204255.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/9409746022.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba4c676f8---57444722485.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/65285514238.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0c4226c2---radolikazokapafiziki.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/60lo8klcavh6loiip9m7ach0in/fajagunowomulugigok.pdfIn PDF document text
    • http://ministerium.pt/files/xelaxesejes.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/6461955687.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/82497798715.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0nrk865f1mlpa8o3hjk7os73v6/76968131666.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31759739663.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/58613027654.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/38356521140.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/43954856187.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/rekofabebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+abstract+in+research+paperPDF 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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 18520 bytes
SHA-256: 5aed548e85549818d6222edf4f7b04035db1bf50ba6c35ef5430b610886fd320
font_01_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 10844 bytes
SHA-256: d18e64e91ba5329cc5ec58d507d9fe647bd0a0d39f35fd396410ed7c780c0a43

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