Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c90600e49cb074…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 11:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 861ebfe80b92748fb5eb3be82f0d2b6a SHA-1: 6057577f4ad807a76dc7bb43de748b757ac40cbb SHA-256: 16c90600e49cb0741fa9252cabfe029570a8af1cdbdfa39938a26374fad9fe61
204 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, indicating a high likelihood of malicious intent. The 'Browser extension / update installation lure' heuristic suggests the document's primary purpose is social engineering to prompt the user to install potentially harmful software. The embedded JavaScript and numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, further support this, likely serving as download or redirection points for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://wastran.ru/uplcv?utm_term=imply+vs+infer+worksheet+pdf PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0ef3c2e5b---roxujufefuvelulam.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/75525158762.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/49555473751.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/depikukenijim.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wamituk.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/tikimimamibuvikono.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29cd2c0c70---71454422664.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a965031b1d982f6aec3588f5ffb71255/zelodaseberuvusuvi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/dojuxakon.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/buvozetipebinavaroxotiw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1ce5a8b3---xuseposamexokib.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pqlvo9d9vrn0ii81bau9c9mq5a/92438569911.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/82014766180.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/gurugowa.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/9705007643.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/4701562970.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gutoniguvoje.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/48573510001.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6693a2b3---getixiluwutiranemugize.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202108261941084830.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vebawuvepofagenimufiwonol.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a60c6132350e8055223f03ee1d53a62c/lafuzonowopewebu.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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 10912 bytes
SHA-256: 0d61b4a5eb8bbba042baba45983fa094a1a61c76ed0c57e5790c3081ee0009e9
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18380 bytes
SHA-256: b827d879622627ff5439f593b27fea0dd1e1d5e6a33171c87601e8bda5a3da93
font_02_sfnt_off00012013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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