Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ea9f813fc1a4bd…

MALICIOUS

PDF

75.7 KB Created: 2021-07-03 02:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e781544f894d12cbeab0852ebf2505f1 SHA-1: af14f31a50c25fe8a98f25854d2bf4db2d2a1ad7 SHA-256: b6ea9f813fc1a4bd87d58a177ed23d1da03dcd8c48b6168af512de3cdc337838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • 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.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fudue6a7o7mqfoai4d0c49d6u2/tagidipalopuxasanaxik.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4635cf3e---96312259204.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/62756596371.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/68056414785.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b862f1dafde---kojiravixer.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/89223846113.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/84909669496.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/kagufisuluwiw.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/3331288b2e89c34a444a9d53a5b6feba/selefodukaxeselim.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/81794327687.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///83512336989.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/29493128369.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/23393189872.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160944ca927f4d---werokugotavenidija.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa4592caec---wasitifodeg.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9767db2ed4068e12ae55e6033f302f72/dexeporasovefazawepen.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/50807284654.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/pogog.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf2bda9b1---vilakivejuda.pdfIn PDF document text
    • http://gerocuki.hu/user/file/bufimufakevo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe4610b8a2db3d1fd615ca88cc101186/47461497206.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43ae052b5---famuvi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbcaecb0c---92020198500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=last+year+ips+exam+question+paperPDF 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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 10784 bytes
SHA-256: e7863c37a6553b6065be4c369542b1d234fb7b07f1cb5e5a10368ac718a81504
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16604 bytes
SHA-256: 08203e93feb920d5e03ea1edfde6d23a69ffa83fd4dfa26ba34a3d24a1ce94a2
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1