Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2897a5569242b2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 14:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28d29b19d159d24935f4650cc41030ff SHA-1: b38c28252fc45593faa6d1951982a857d64d29e0 SHA-256: 5f2897a5569242b2836090887c9abe7916dd87bf4fa6259f18f5c662733e6472
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or further malware delivery.

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073729293dc2---68337967548.pdf In PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/fodab.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/30956227591.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111fa60ac72a---40526267468.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/fuduposofidevesajazunig.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/vesapis.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a753c80b025---rojosurafavuragidufipof.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b03df280fc2---40218474741.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/38796409102.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/39214617660.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/96861636945.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecf6879f5---3948904401.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/dumozizifoxewulovapogafo.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/66388813798.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/puxajasodegarodajunopevi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/xodipabut.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/woxagulopunabu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/8575507620.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160706dee9686b---wupuwagut.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g8qss0m325l70ija9vjbs4ivbd/57881411186.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb3b7c219---97695030523.pdfIn PDF document text
    • http://qca.ch/userfiles/file/xalebadoma.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/93489686446.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b34fb8d666---95610993981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=marvel+comics+civil+war+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 16964 bytes
SHA-256: 587e6f23ce5c77775154a357bb145517d71cbfce4c0d134e79e6b8aaf3bfd7da
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 10724 bytes
SHA-256: d12a1463c0a5fa68be743c9fd478332de795fdab656748244a0fe3957d1f8598

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