Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9fcc881e2581f3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1860bffba0221042fe88bd879c01340 SHA-1: 51160f200a1516147334cbe94c2d5c808055034e SHA-256: 5c9fcc881e2581f33bef2176451cdaeb32d77af73623ae1f8f829544c270dea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to malicious content.

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://phaptangpgvn.net/app/webroot/upload/files/99906882319.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/47h53tmuqm3o7ruol0d4tq0229/dimumavonejofebawa.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/6l1titb8emibp20i6tos6c1g7h/65880625376.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4df1c11b---7991553064.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/memutupogedowi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c16152ba---pekakesinokubadifakawuto.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/barib.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eu9mb8ql8em087u9q76m8vst94/63907573365.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f42b64b3f798c7c39b19ccc743140c9e/65885789192.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/nozawojijolufa.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/62965896228.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/gudumubiponawovinunolivi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6527cbb2a857fd8423b19cf8362bff8c/65262193612.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lh8u10n76t9hq87r9um13tnj53/mofijukimuza.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/7351557044.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/juwelasirupiluwomalilad.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/divilugakisowurimefova.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/34323840902.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/keforokod.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72ed2a5b04---82895634181.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/94562106456.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9098f1fe---sukatabanejejezi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/fijabibenaperex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lenovo+x390+specs+pdfPDF 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_off0000b3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 10704 bytes
SHA-256: 57159455a4b99ecbbafc9d7cb108a232435ef04fd4345bdf6e6eb8a184ababfd
font_02_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16988 bytes
SHA-256: f41cf48be3b7a2ae0a0833956470df9be3f4255d20cca61835e44c5109c3fdfd

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