Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4bd7281874266d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 22:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6991425badc273ff66e014390485ce3 SHA-1: 9f1ded876f58f5ace95c0091462f373c5fa5b36e SHA-256: 9e4bd7281874266dce9797285b03fd36269f0cc91de569eab214c02318039fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to the download of further malicious content, such as phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://spy-military-labs.com/userfiles/file/netewiregovibibur.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/si7m5a6u1k8qctt3hsi5614kt5/66833862387.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/gorex.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/revomolufosu.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/tozoxavogojapotesix.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/37e6cc2d63f7d6cd8d615461a0716423/96307486400.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/rumepodixejifin.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/fawamijod.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/perofopubarito.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f18b23c71---72410045316.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bstv9greu7gp15pmt2ecvdhsta/nixetufubadotukimotede.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pofibitobopeku.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nuvezoxatevatebupoj.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160785cebc14c1---63218874727.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/22625013184.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gadimoxopiv.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/motug.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e808ccc42e---10178892458.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/28170521913.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894b053445f---76563125390.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297f7081b6---rekitebudumovaxigu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/81259878831.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/19591521037.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/japimutobasinetapakumuf.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kejodar.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad00aa340---26299442698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=paramphistomum+en+bovinos+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 18964 bytes
SHA-256: 0538f240ab31b304994e69b29821ebf177f6f4379eae1b84353e35fa4125e2bb
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 11024 bytes
SHA-256: 22461154b4562e7f18c6ceb67df31b49835c4cfc281cf692d08354ecea37d40c