Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b487ddb133bc0b…

MALICIOUS

PDF

126.3 KB Created: 2021-07-16 08:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 111eff05051a2d77eff6d07eb6bb09e7 SHA-1: a6c685e75afab1fd47f735619db7490c8d6d3be8 SHA-256: 50b487ddb133bc0b8e3ba6790dbd152541d2b7ce2b12c85dc8a18eada66b3d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://inwebjor.ru/uplcv?utm_term=utopia+meaning+in+bengali PDF link annotation
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0a6944b734a74072295dd932582a26f5/85707296872.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/74386235586.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/20209056767.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c479feed7a4---getekasomumej.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/50409301814.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/71406594136.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732b04445c8---84651206968.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/48670c6efca0f0a6f45958a3dddc2332/guzifisopilifevefote.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/11204476188.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e56d94f91---3146958519.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/19965f6424c897cd60469f4985158e0a/vazugibuwavugedeve.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4c8bb10fa---53179204499.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/piwizazukepafujilimapev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c71ee58e1---rawujozivulowil.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/23975370511.pdfIn PDF document text
    • https://digireg.dk/upload/30242765858.pdfIn PDF document text
    • http://nfc.soo.jp/file/pirigopugifenokonifasope.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/ladoduzanadofofixid.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/57363795191.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f04uoiin23td0cuc1t1h1ppcu5/guzazisebijodazefaxokovu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-10/20210710144950633452.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/3b2e707737d2da7a77d3ce80a62c21d2/pefib.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/mfe8mi2no56736h2qpl4atpvqp/18812730601.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cce206905e5---25342029158.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17881 21856 bytes
SHA-256: 63051b1ebbf9759cc53351f9bc7c616bebf522209da8ce4af0755f5922e3c893
font_01_sfnt_off0001ae8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE8D 10476 bytes
SHA-256: 25be539c54dfde4dd2dfd8170df01c7505fef556e3b1892bbfdaf1ea03a68140
font_02_sfnt_off0001c60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C60B 3348 bytes
SHA-256: f1123423612ef77de201e078def914bad8c7f518bedb60234ac25270bf05f2f8
font_03_sfnt_off0001d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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