Malicious PDF — malware analysis report

Static analysis result for SHA-256 b237a76f76a3d020…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 15:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0937d46bfe9c71f30348a884ff1e3c63 SHA-1: 424e4fb19511eb1d9258279c44a7d155036315af SHA-256: b237a76f76a3d02066c8ff2525a165b66400de372fe210d5f6ff24916ea8cf00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as a lure for phishing or to distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2390983add---19633335917.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/mlmt1fospbspduh306i783kumm/68064655270.pdfIn PDF document text
    • http://tai-group.com/upload/files/13832751588.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b5493e953b4---simafiwedidikudosupixotim.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kojanene.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/41325378944.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8a11a7f---xojilifu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jiwuwuvutofupujarel.pdfIn PDF document text
    • https://tsolisp.com/files/file/fisowu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099cecae96cd---bunala.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc35cb67a---zokarerusotelavugi.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/76416886347.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c82ad4426---pomudilujipalo.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/tubofeguv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaf8bd67d---kuserizovivalek.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lenolefake.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/rivuwemamozivekopelamen.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/62995845020.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/nafikemelediwonegimegu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/298b5b389d762134df2c12afc43a0263/66814059371.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b4bd5b2a---wekebiwaxiliduwipud.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5a787180---puxurawokujivimuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+are+two+adjacent+anglesPDF 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_off0000bcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFA 16372 bytes
SHA-256: dc4ee961411cd6d16bc8ca665b93871b1b5d8e852d2f589446ca61830debd883
font_01_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10764 bytes
SHA-256: 94cfe1d6ac599e979bcf66674a07cf6f7e85a4b14ed9cc13875ce492c4c15c14

Open this report in the interactive analyzer, or submit your own file for analysis.