Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d023302cf2903…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 13:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8149761f5a20930827d40cac5cf838d8 SHA-1: 46970a060e0daa6c523ffe23ce82600ce929c43b SHA-256: bb4d023302cf2903afe53c7349debb9a08a107ac8e41a2cb84df07cb60b5a82f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as redirection points.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.darvidproperty.com/news/file/napikakufilorobasi.pdf In PDF document text
    • https://abofahed.com/userfiles/file/kelemowujemosepupijug.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/moxozukumeramomoziviso.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ceb0d895---rutudi.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/badudonokugosatubigivewo.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/17362047260.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/rilomekovajaj.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/92416399543.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418006b91a8---zagunozefo.pdfIn PDF document text
    • http://wohingltd.com/userfiles/81386035950.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/de89e8d68ff290cec4c20d86e2ad9ce1/worinosirugeretilo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/jurutufake.pdfIn PDF document text
    • http://yuli-china.ru/d/files/78201697857.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4088668624.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/15027783229.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/balajefujekimo.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/60440281843.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf184e694---92917715755.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/90008135539.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/54330303062.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/61616802810.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/vofunanedukij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=turn+off+developer+modePDF 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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 17892 bytes
SHA-256: 0e979a5fe13d5ed893a68c03a3163d3856becd13ab5e93814eb9f2d265e65093
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10268 bytes
SHA-256: 637666efd8860897a296825b6b1903fe95a851158c69f804f71fe1b1fc94a890