Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a5b9524da0f5c2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 11:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b12bcd6108c9f442b301ae521a8a14dc SHA-1: fc0a499b159bc6df892d0259495bb508ccc41d1c SHA-256: 18a5b9524da0f5c2e2d0d841c7162be7421035e3d7fb58048d9d3ba5d530bc48
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted from this sample, but the presence of multiple external URIs and the overall structure strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b3a5a341141d0b0d8736f54484b62518/nuxasonak.pdf In PDF document text
    • https://aonetreks.com/uploads/file/kelivuk.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8baed709---77819269434.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db2c5026bb---43137627867.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/99293239974.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugifabopipowumijimagafi.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/35191470510.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7c8f53356a4652fc1d69d5fa09604cb4/53577509430.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vobof.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210821_185236.pdfIn PDF document text
    • http://malifer.hu/upload/file/likasobawifasefevobopag.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tixugisazanaminejo.pdfIn PDF document text
    • http://garderoba.sk/images/_file/33705566820.pdfIn PDF document text
    • http://ridendo.cz/files/file/26311592079.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lvug0keolopitt9up5juo87rr2/biwolukuxenubupotasigad.pdfIn PDF document text
    • http://www.bandungmesin.com/file/13546509486.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/89823284665.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d30de93cb---25637330714.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16236891915637.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833bd15c5e0---63008026095.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/80114011312.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fjm3n3t9f76ev3j8jcstn1i69c/vebomovojiwixakupezelux.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608278e3d41c8---pakalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=present+perfect+tense+past+tense+worksheetPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 18116 bytes
SHA-256: 130435a30d7bf5b783a551067499b9c7279e169e8f38f2323ffb6697fb6f1302
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 10620 bytes
SHA-256: 92343dadd26f44bf7be7cc02b1e276a319668e38acd443ed67db58e02848f027

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