Malicious PDF — malware analysis report

Static analysis result for SHA-256 51989ee58923db69…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 20:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29b11a318b595a61e990a2b837db0ead SHA-1: ea70e7045423e1cb058b7c406a1cc3cae5979065 SHA-256: 51989ee58923db6963d611890613c537b20d4031b67093e4d53c767182b331fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smartvoicecom.com/userfiles/86839432727.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147bf40a0c18---dufivobivelezexepireto.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/88600699000.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a55a6e8b---75221937758.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/nisebofobituwezixime.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/rufem.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/12984134396.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/butiwupasigegadu.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/97382642514.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/54426402601.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210906_015519.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/puzesulipiz.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/zafav.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/41736299939.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/dedeladubi.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/memokalitobidonokife.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/87871706228.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/558061e204ae69f504ed5dc590e5a912/wagemakajureviki.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9cb9da5d2c76acad829c41a3173526f5/xiruke.pdfIn PDF document text
    • https://synersys.fr/contenu/file/zagosuxopujagem.pdfIn PDF document text
    • https://interconformity.ro/images/file/75775343489.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614995792bc8e---guvimapujarisedevoze.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/dae6b22aeb53507286bb1ecaed9bb194/41556387398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=geometry+dash+1.6+apkPDF 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_off0000aea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA5 10948 bytes
SHA-256: d4a1650c57d298c079a6081ce316d945261e55ba7fe02bbabe375825bad16cd5
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 16056 bytes
SHA-256: 2f7efdd05adfc7c6ede330d7a7a5587796f5a2dc54e69a3b882bb4c809423bf1

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