Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dcad65bca53903…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 05:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: db014555ed8ff2971c291ddce1fd1ebb SHA-1: 7fdd8a031ab8f7ef881112c911acdebe8afe7146 SHA-256: a3dcad65bca53903ae8d314d4bda0c5b60a2deb3fc5cddc9f6d307a9729cb06c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs, such as http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608829012fec0---jemulujuxepogugo.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ijtm.in/userfiles/file/1121432926.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/zixivekimozapekajipisig.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/90811436742.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/56555835086.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/mefanovedabe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4eo69ucjgg3gh4abnvi1lcq1q4/68925564464.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89954556545.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/52b44a6be2c12caf10aa302cdf1b9438/fodaxidafupo.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/dejujagukanux.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/99077594363.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/24930156031.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/50198195664.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/28787837145.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/14666314104.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608829012fec0---jemulujuxepogugo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf23fc9bf1---repepolomusomenif.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zoxifiput.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/50979318182.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c516d69e434c0be2e4deae74f32be121/nusujasurozaposazokukapi.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mupizizokanolix.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/bea471e890706e63e4df0afc75610436/lenudurexobutu.pdfIn PDF document text
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/jebolefufiresasuno.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa813496d9---tawajekefuwizudisa.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0acda39ab---bubanopawoneripa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=when+is+the+earth%27s+birthdayPDF 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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 10460 bytes
SHA-256: 57bfc7d771a5be70550832eee3a23998193dc8d21ba96d5939d5c02989276003
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 17648 bytes
SHA-256: 167a146070257426f3373241fd91e9c6bd7208eb1591f9244a6c724afe229988

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