Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfea4d9ebb54d528…

MALICIOUS

PDF

102.5 KB Created: 2021-09-03 05:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a57f1b4a4565a0d70f4e2136dbc4fd0 SHA-1: 3edf24693bec9127f3280cad70311f0b1af48b9c SHA-256: bfea4d9ebb54d528168a18fb4ae95a04414870efefdd9209ecd18f2133c41d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0843befff9b2add09a07ffc735c2fb40/19768667451.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1j8krs7158jfb788jtb6apjn50/7774794905.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173c1633cb---tofabex.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/mebenimepusatalitexarov.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45469148a---74139357094.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/madeliven.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4e7702bb4---vavujek.pdfIn PDF document text
    • http://armanetti.com/images/38682763547.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6eb87cbbfce1fca199f29c86bc9aaf03/73693537435.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/geturolozakakefiwemexavuv.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bovuromoxikuzosated.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607877aa54b21---nizulidapomasenorilomejek.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/72730429009.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/64339430407.pdfIn PDF document text
    • http://yilip.net/userData/board/file/weganozeditilefak.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/nogixavudoluwefa.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/roxolijudapofobixikibe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100d4d75ac0f---6037569112.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/94897338304.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff379def34---29627882668.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/ledukisupefuwekuwuwo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a006c0d65---satupapala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+annotated+transformer+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 19512 bytes
SHA-256: 6602b5593b96a37e76c66c01f45f2caaaa6ff2a05244b753839c33d95de3ff64
font_01_sfnt_off000152ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off00015ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA1 10588 bytes
SHA-256: 74ab6047070b0d7a3ad6dcb30bd5259c892a3cc930175bedfd4d38877c2d00a8
font_03_sfnt_off000173a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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