Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b5b8c1b048edb3…

MALICIOUS

PDF

80.5 KB Created: 2021-08-05 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eca49afcbdbdbfda6450e9ea21fe7ea5 SHA-1: ab10fdb90aa1c0f6c870e576925caef58b71280c SHA-256: c6b5b8c1b048edb3fa33583e7674839ba751e8a16a5678bf2db5cefc9fd42b78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oversaslogistica.it/file/notezorej.pdf In PDF document text
    • https://sayurmateng.com/contents//files/33034087506.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/fuzakadebi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3314f71b---50679872713.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/88800277549.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3dc1a53e1a685e3075aa64d6379e6934/25129814051.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/jidokatijupefudilij.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/54606254995.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/073b033508f3d2c3c4a1143f0d6cf793/23669705403.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/fnc6i34jak0nqokgte4dllbab2/sekisog.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/54198134907.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9bd842b79---fuweredejako.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/oj2e38bqcc70qqg93i67mv1bmd/48652386922.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/58hjqguc5luh2m77oq1k5j87u3/55858054790.pdfIn PDF document text
    • http://aimic.com/userfiles/file/36888266644.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/34105462608.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/89342791203.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df7d09aa55b---ribezokegabodam.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8943c4087---96212690584.pdfIn PDF document text
    • http://drironcat.com/images/file/vugasetuwekigumalidagu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/37947420724.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6lkikg1prl9vcr8t47eq0s4otl/22140604672.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a69239c25a6---26657472752.pdfIn PDF document text
    • https://digireg.org/upload/devuwetudijanonajom.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/toxumoxaladopixuguwokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+prestige+car+alarmPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16544 bytes
SHA-256: ec735127288f0d0f17273c19d2ee2af4ed2bcfaef6c9bbbe4178ba4b73c31049
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 10792 bytes
SHA-256: 33477ac9e3d7d27c18b857ce07140dd52677fc69c4224c52fbc3215eb254809a

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