Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1649ab49219534…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 10:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3f0a9458af7acd25806f16836925d12 SHA-1: 7209c8ed6b145d2c4eeceb884bc24a7096ac793e SHA-256: bb1649ab4921953408ef102519ab2bbfe8b462668f8c63a2e0dafb7daaad45fd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 Security Software Bypass

The PDF contains embedded JavaScript and multiple links to external resources, some hosted on compromised CMS platforms. A critical heuristic indicates the document instructs the user to disable security software, a common tactic for malware to evade detection. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • 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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vjkvg381fp76t316e6fhouooq3/27161353657.pdf In PDF document text
    • http://animalscipublisher.com/files/upfiles/file/51227809069.pdfIn PDF document text
    • https://tappowine.com/file/gaxivoxezu.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/53442799514.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/wigow.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090667462733---fibokodunajubama.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hcotoe9ib5eqp58d9ae8pvrnce/jipomapax.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106ba7fa3454---juduketo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ralugotojibovakuvugalew.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/7358004282.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/dexusiwijatunixa.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/75547020382.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/46348591538.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/jokelala.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/97307d326e1a2ad46490f5be31ebe8ba/33750889264.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/738f85150e2fb0729ba480dcf369d59a/dopodivikojagot.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/57561563203.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/porazepirorutal.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/pejepaxedasited.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ubiquiti+unifi+software+manualPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/davewawoxafitagokimebovug.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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 17780 bytes
SHA-256: b24664d7203c019f33d8a0094c23f406face27cb1a97a6e3cbffe3e080fcb8b1
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 10856 bytes
SHA-256: a075609114c89d587c2a792728ed5bac9ea21ce4fc8a327cb0696e354f3b1219

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