Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ebaea16ab1b5ce…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 01:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26942120350421b954f0538696f51cff SHA-1: c7f66b18d6aa531a5e8af6686b67bfc3471f21e0 SHA-256: 65ebaea16ab1b5ce93f97913e9734d0cc04361d2a8101f06e1d163a4a4b19439
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further payloads or conduct phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=pid+controller+for+motor+speed+and+position PDF link annotation
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1b354125d68573b8dade1b294979e020/vobis.pdfIn PDF document text
    • https://ijp2.com/contents/files/sozotasodo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5083b5ed---sesusakepuf.pdfIn PDF document text
    • https://invest.pl/userfiles/file/kokivubowijujivewobus.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dogigijigopujukalozodu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/85290493552.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32154d5f6a---94896900259.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae16e4d1227---luwokerijuza.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/je75go8pkobj76ntkanblfbmr3/galefapip.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/31775475481.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/7306d639ba9d4cb12e8d8a977006e992/71231670780.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/68513d8fe82bfb04b10c4ba3ed90ae41/26610425614.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f6b5132da---xepiveraz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104d87722cde---mavesitoji.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rinetejoxu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e7a67a3a---51885699902.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/83040071868.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/k2kb9umghdifnrgftcrpahopbd/zanivikunokagazamaja.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/22438360802.pdfIn PDF document text
    • https://rajakedua.com/contents//files/59993310390.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/popizumumivusilebanovep.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afd48547385---80831984607.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/potupenukizuluma.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_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10780 bytes
SHA-256: 0b8f1f135ee86a2df8ecb497daac8e5cdd0fbd45d50327103fe891ec10699d38
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 17496 bytes
SHA-256: 0f5260b8dabedc59d7e8e7444085cc6375b17bd62ee8ca0c95cb172adb0d8f6b

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