Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0745c3a23cfd7db…

MALICIOUS

PDF

74.3 KB Created: 2021-07-01 23:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7aaf0ad047f033c085c0f86896891199 SHA-1: 5c475d4ddcd42917fa9f618f89a6c98e59a6f278 SHA-256: e0745c3a23cfd7db46dc20404d380ffeff54cad8fbae3b7e2970f93c7e613292
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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://synerhu.ru/uplcv?utm_term=paranormal+caught+on+camera+top+100 PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0299f97b6e---dopuzufide.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/81115969260.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/88742625158.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gominuputadibakomufezatat.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/86td25ge9m8lnsdpm4q95jje2p/robesaxofujek.pdfIn PDF document text
    • https://soechi.id/userfiles/file/bavikineroloxulonesewoni.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/29202273030.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/o49ug1d5o0t124p3gbooc7h2sq/67334826342.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf02c0a40---52397474430.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/da30da734c071804a8857410dbf4f663/21254729722.pdfIn PDF document text
    • https://tangentemag.com/img/file/pewewudifogivenifiwotiza.pdfIn PDF document text
    • http://lucann.com/Upload/file/xobuguwinitenakakofulex.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f65936d87f93c8f6ec66109c7a255a78/momawuza.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rudakomajuzujufaguvug.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085201dc4197---mulofupezikopejurotelepud.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sedogovuruna.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gezikumow.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/80l78lpu8bfh97jc1471kkmg4b/55176116357.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/woxesupizezewozumoti.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef8cae9e0---xosub.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/vifipumiwegapig.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872f474c56e---netijopar.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7df8de31e539179475a1541a5c7bf4bd/xisolenakagalumafowok.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/tazawasofigugajonavalexoz.pdfIn PDF document text
    • 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_off0000bcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 10836 bytes
SHA-256: ead4228ef2419f676c41966c2772558ab060456ced7eb2574c13cbcec0082d26
font_02_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 17180 bytes
SHA-256: 107f2156230da48cbcf7fdb1df2bc9b437e6bdc668d4e1e87c36af22d773d44a