Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee90ce1b7c55a0f1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 07:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6de94ab94b551f254a2fab602a5e5485 SHA-1: 244a1d834e6585bdae741f2039fb33dde4e08fea SHA-256: ee90ce1b7c55a0f1fca5e85506133f5e894feb3608158c89bdf82d299c68bb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/g8uvlf6hu8862023l0tt7u36f1/bokigufetumakumejuzamuwop.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jixofivexuregoporiwovo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/91222181435.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cd276ebb---matudura.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vepuzapudonesisu.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sijimuvimenejupamofobexip.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/gozojevugabi.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/10712974139.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/siduvakexudizepojare.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pojapemugomit.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/75069148110.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/navigo.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/96536521984.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/77457396288.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/25519520642.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/zumukekizawafowaku.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/79578049639.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613453647ad0d---dewopuwulokoxupojenuvabur.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/17958552526.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf2b5aabc2---divawem.pdfIn PDF document text
    • https://tckontrola.hr/files/jewarulexaxuritizura.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109040728158183.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/rutulolekopupires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+u+move+apps+to+sd+cardPDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 19500 bytes
SHA-256: 0f2aad6591a5c8b679d69a33e1902c6b2eea6e62cadbe3940638641ca3874bff
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 10676 bytes
SHA-256: 99b4ccee2f28272cb13772a52635589c695809e826b907f9ebc7340aa9c7b619

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