Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d7404cd1b32fc3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 10:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 042371c496890b42cea6ca04749b30eb SHA-1: c48913a4ad869d8da5bf437753586cd21c6d54a9 SHA-256: 72d7404cd1b32fc39b5116542f8fcb8b1c49725f5601ad7f428cfa57b31c48d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution scheme. Notably, the document contains an instruction to disable security software, a critical indicator of malicious activity designed to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 https://philabc.ru/uplcv?utm_term=gta+vice+city+for+windows+7+32+bit+highly+compressed PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba650f2a57---71204494506.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/xafubesuxefof.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/55543478552.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/16556040183.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23f52e3e5---goverixog.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/linurawuka.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/vesumugexila.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xavovixalarero.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/revoxuvasukabasig.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/parusogabe.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zadizat.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904205434483.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc4c6cf3f---85266134326.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/rabametenogo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/44108426590.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/47198029556.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/30079323697.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/nugogemu.pdfIn PDF document text
    • http://webs123.com/userfiles/file/2375064814.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/42744988015.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/43838718778.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/vagilemeketuvo.pdfIn PDF document text
    • 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_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 18280 bytes
SHA-256: f9e7d5b74fd49b4f8380c4442ffa088d5b2f8e6b3876deef3771ab13c6ed4d02
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 11856 bytes
SHA-256: a2439b943f12e10d08aa7fd38b675fd5b7d8c967642a782b7263b3915a109773

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