Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafc184f42d9cded…

MALICIOUS

PDF

67.4 KB Created: 2021-05-30 02:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 16bd429103374e54b6e72739295eebed SHA-1: 60ed80da9a49ffd483e4ef9f8e5d80d55794ade7 SHA-256: cafc184f42d9cdedbf1397afe01cac7ecbbfbd91745fc004293884c2e35f6e7c
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to compromised CMS upload directories, forming a link farm. These URLs are likely used to redirect users to malicious sites for phishing or to download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fe7ab823---xetevuworowuwog.pdf In PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/dg1qh4li6hu95rbjca2m34p2sv/vexomarogosapatuwivexo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/h8i5i76qjp7n0oaoe2rjkba4i5/lepuzolododakiwir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073902916537---60009441178.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wuwebebeme.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e3307914---67991325429.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ed036fdb---wegevamigidarerebumugi.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8435062352008255b703a4a6ae107737/tawinavigevukolukusagom.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad7bacaf9---77766708867.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607721a641555---memegalurisunabaraxax.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/notokobomove.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/36770754987.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05b98fffdecb581589a0dcdbcf0507cc/dadegedozupuxu.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2ab0e350---37654986157.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f822bb91---80754206680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=trick+test+for+following+directionsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 5084 bytes
SHA-256: 5488e2f9d051182061721f3225da9db47d3f044ee5f204b2a848ba7234965d39
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 11080 bytes
SHA-256: f8bc6584149a36421d9fa0966c00229b566811261afa3827457dc7dc8c42b6f0

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