Malicious PDF — malware analysis report

Static analysis result for SHA-256 7136015ff0d97589…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7173797410cc83affd4890e832161d05 SHA-1: cf5cd9675982b3e64f02cd45126f9ef7da73ed93 SHA-256: 7136015ff0d975894eddc8c184e4832171e03635e6a67a4e3a8b2dfe5271956d
212 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and instructs the user to disable security software, indicating a malicious intent to bypass defenses. The presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggests it may be part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mothertheresapublicschool.com/userfiles/file/89737983052.pdf In PDF document text
    • http://isotech.si/uporabnik/file/fogunu.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/femekatibunefuda.pdfIn PDF document text
    • http://timebymtm.com/upload/files/67601059773.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/10325757031.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/valup.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210911152435.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/34755526942.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/29e324c7ef0371a50cff4d63929e1987/gamiruvipi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/tezodawimemanameruxelaj.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/kevivalawopijadapa.pdfIn PDF document text
    • http://snsi.jp/image/news_file/poxulakeg.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613908fdad39f---femifijenusawelobakipa.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/35004278870.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/21961321181.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/35250473625.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/72114528090.pdfIn PDF document text
    • http://cudicio.it/images/file/juxakadolexekoliwulopuvin.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • https://33mobility.net/uploads/files/mikurovegig.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16956197004.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zuseniruxulukiponaxafule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=call+of+duty+modern+warfare+2+campaign+remastered+crackPDF 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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 19600 bytes
SHA-256: 9908e2ea9b244c8bf2977d7d1cf98609ba4ac5bb9126443ad48230f5232feac3
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 11504 bytes
SHA-256: a23d04ae2e94ebacf8b19280889f83bfef4e93fbb425908c51891484cc4fbac1

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