Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7411433182a4cef…

MALICIOUS

PDF

83.3 KB Created: 2021-07-13 14:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 974286664eace496f987da1cd56906bd SHA-1: 11d29d1d1163edfd3a436c265be76d45cb2c3b4c SHA-256: f7411433182a4cefa2e6364d2d838e9c1688cb620669a696b2c7de1211bf1539
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host or redirect to malicious payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608886fc69ee9---xodinonu.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/e6m3kvpm9pkki7r9aeb49inue5/zumodiretakibepunuxawibam.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/afhsehs1rb34dfj76kp6spuo8c/37178666387.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1e828c71a---3384448876.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dff22593e---78306850740.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c1722b0d819882ed6835f8590ca0d88a/wulajuze.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9573ee9ab---65371151948.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/de177bab9995606cd3e9446fece7d0bc/dimedexizimupisisitobusut.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a527bf5edf6---74254133455.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/sekod.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902dc9b92de---muwaduzawizujinetule.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a960801930a---39134789438.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/00f592f4c8f52a89a7566977461e1982/kitononamasuwuvowadi.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/sesukeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c79fe7537---baxawumegubufiwonu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/be519460f357b7379cf26bb84c8b609b/53633595113.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/ed833b61c4d9a17bcb74169a7d7c8f20/54163164114.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5403807d1f---sexevexotitodekubogosuz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4b42c0ee---72572169547.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/57805947755.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0419f9d8---wavuwibofuvonalam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ductile+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22A 2176 bytes
SHA-256: b1da2d416a217157ded7e7696ae27212de9afbb66c83597e9ad2318cbe4b3eba
font_01_sfnt_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 10284 bytes
SHA-256: 2d37f831136a00ac95d06bdbe7219befa568e4aabd1423db176f17e1d744d84a
font_02_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 17536 bytes
SHA-256: cc2580512d4483d926282730ca847228430177dd37cea35533876169c105f48d
font_04_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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