Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ada5304b9effe7…

MALICIOUS

PDF

68.4 KB Created: 2021-08-27 23:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c60ff2024d8cc8728a8355f63bd965a1 SHA-1: 2cf285f0a55b555b2d5d3d3a7723b7cc34124554 SHA-256: 51ada5304b9effe78e14d0761b3b8e9eb04807a1bcfc6254d8065fe0783b4964
154 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 functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing attempts. The presence of compromised CMS upload links suggests an attempt to disguise malicious files as legitimate uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9425

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://rasciindia.com/firetech/ckupload/files/korega.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd4dc1427---ruwik.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/58192584054.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/4627084616.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/96151100008.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ik51o7h0mgfuf7cq21au6pl1j1/xedomujazebipenezujobawir.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609625044d9a5---90694019249.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84990766466.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rvp7v6mnt95tc101rgsh4n34l6/lupisoluxuzenugu.pdfIn PDF document text
    • https://armenia4d.com/contents//files/44719854244.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/19854905208.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/01dce68349110d801d18be97bcc47b44/26678573453.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/tevolodajoxufekos.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/paxiwuk.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080107e85e26---zanovaf.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/9gloc84atgq3907g004du969m8/4021350224.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b62eb87ba22b89796f751b0fe9af48a0/vutogixijifulogudopaveza.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rorolulawaju.pdfIn PDF document text
    • http://kalikraft.com/images/file/vumekosuridekadidejokuzol.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/90147352746.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/90236505704.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fatijisoz.pdfIn PDF document text
    • https://puppometalli.eu/file/68345712905.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c70eda30bb---92056782797.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/57074347555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=autocad+2017+free+download+full+version+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 11048 bytes
SHA-256: e4130551bcfd6b40afa5229b572488743eabef05ed6499f9c65bf8352b515c15
font_01_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1