Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8baf4e9dc9e0515…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 08:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b6653e03def975243afa28e3912bae4 SHA-1: a2ee01b93fb87c5e394c7d0abeb5671234ba6533 SHA-256: e8baf4e9dc9e051535eb0aad6feafd6d8de478b75fd8e2c1a2c7092d6cd83f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=a+textbook+of+quantum+mechanics+pdf PDF link annotation
    • https://terracetemayonetim.com/upload/ckfinder/files/53605206687.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe3ae3b96---87848919935.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/89908995542.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/59825216517.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/98207657206.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/83318467499.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/gezokemagafalexuzije.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuxepomezadavore.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/16263454809.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kavobasetodi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3517e0eb6c9e4d7622a5f52275cedc4/nuwebefubiwoz.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lotewuxiveloga.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/fizobumiwijexobetawir.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/27686452761.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613954fe2768b---lemerisezalefo.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/39835014972.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/98050914233.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d32aba0d2---57054525332.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4968efefa---7831616829.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3635cdf8---76767030602.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/23989606966.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/tulalifekavop.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/guzez.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/57618644785.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/3236744655.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/danobepapew.pdfIn PDF document text
    • 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_off0000c053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC053 16912 bytes
SHA-256: 98d6c72f6986eeacad051f6ba506b9f14ca50cf34428c545f68faac469e477db
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 11300 bytes
SHA-256: f4d4c86772ce9947657147bb8d1f9d4efabd636d1ecf47a4234a58dca45d2505
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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