Malicious PDF — malware analysis report

Static analysis result for SHA-256 5794445cc73eb6b4…

MALICIOUS

PDF

110.0 KB Created: 2021-08-31 16:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65480fd0054419ef79b7fdaefd360aba SHA-1: 77b06143d2ecb0fc8ca9bf81e4896d64379037f8 SHA-256: 5794445cc73eb6b4a400f8f6efcfce29444c3e1643ead3b3f85a9b9ce54be111
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links, many pointing to compromised WordPress upload storage and other unknown domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.aqsclimited.com/EditorImages/file/28490752098.pdf In PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/62298583783.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/basometijog.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c91553ae76---pekuzoxejanurade.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rulegogoku.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/wakixotojogarafiwir.pdfIn PDF document text
    • https://orangerun.re/photo/files/58061547513.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/55840641318.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/xoziloja.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a020bf3950a---56889427047.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/fasarunitan.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/99522887088.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/25017762759.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797ee92af82---50878873468.pdfIn PDF document text
    • https://majubesar.info/contents//files/keremowofi.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/30894973358.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/30786107400.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/bisuzekosojaxim.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/93670132439.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/suveziwolemuzaradokosonav.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160853562efde6---64102042179.pdfIn PDF document text
    • https://webmenuplus.com/images/file/28072542636.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/53879356920.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210511065930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=another+word+for+inspirational+speakerPDF 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://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_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DE 10756 bytes
SHA-256: bcd5e6acb9764a2fd08043b7b7bf29e2e6c4c305e7111414e6503e66b3a34122
font_02_sfnt_off00016ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA0 23664 bytes
SHA-256: 225152f7fa37de6609ee7174f62c5de4d034c9d757b4aa506d28f62e22159487

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