Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a59be1a3d1b6aad…

MALICIOUS

PDF

95.2 KB Created: 2021-06-26 23:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2650758dde163688c9c7828df0020fd2 SHA-1: 81dd6e3465cd73cac3c7099f94ca9e3b6c01b8b0 SHA-256: 4a59be1a3d1b6aad526da4475f90b7888554fcf49e85cb88ea93e0e4381cab4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by initiating network connections or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://medvor.ru/uplcv?utm_term=lord+of+the+rings+fellowship+of+the+ring+extended+version+runtime PDF link annotation
    • http://geoodwierty.pl/files/file/57052402662.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d285d5dd51a---18148960253.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/99549487052.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/33494390536.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u1n94s1ftbcolnomncaeuilkie/dogaburiwobenenubiminobe.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/rixukodamesopafas.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106240443206110.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac435532e67---59546279211.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670dfed19c---revitexok.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1648efea---65181081228.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/47894799740.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jipusevuzosudozanudebuk.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609af582957cd---lujimir.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/okam.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607469261f4ff---kawiseresedemadesas.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vejobovelegewojasap.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gesukurotoledikavux.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/33081179824.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8c503eb68f2d66ef3da48e087f4a8c01/terinaxeguguwatularilu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849b18905ba---51594441002.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/91a74236ff640a0007c028f1fd29e91d/pojadalajamekumi.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vilimexufikogowidovumuki.pdfIn PDF document text
    • https://ancoraeducacion.com/images/61802819845.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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 11092 bytes
SHA-256: f95dc2995f3286e3d08b67ac51e26ca442d5e5c9f31d4ebfbc7ce4ad5a23d9cd
font_01_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 20440 bytes
SHA-256: 86474cc58e92f54f99a3bb7cbc0c4f37bb99742ef3c921a39be7d4e18d67c6b2
font_02_sfnt_off000156ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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