Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16ebfa405b948b0…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 06:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ddb5bebee6b3284dd0adc6727cb48dfd SHA-1: dc1012523ed2d13b5620bd5c0d0a946056e514d1 SHA-256: f16ebfa405b948b0e66351f000ed4a5d33e0db7c2b163a76d75e1942c20cbd55
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to lure users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cjsc.se/ckfinder/userfiles/files/92245595855.pdf In PDF document text
    • http://sushinamu.com/uploads/files/19858338166.pdfIn PDF document text
    • http://office-tommy.com/images/file/83566306623.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/34608328055.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/gubitoxegedax.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dasamakakizajezuv.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/zopemifivopele.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/vevekaromorukozijad.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/95579642944.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142402d330e1---25640708678.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/3239338710.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/noputakipuwafilibubi.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/40235791054.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/75115307749.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/63306966518.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480f07448d3---71471940571.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/lejomosuzojunil.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/zedilaluzupivijod.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/bujolatax.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/28ec750b7ecfaea8a8166b83699b22da/guperoduzabemorixu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/20491498882.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/93071696242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=coreui+react+datatablePDF 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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 18184 bytes
SHA-256: fcec38713c314b6191f34af91ba42a9ce44e6b4632fafdfa40b0a8e58be87710
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10364 bytes
SHA-256: 46df622c8d9544b0934cf622df17a80410d5fe484ac438bd8dbfea59499e04b8
font_02_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1