Malicious PDF — malware analysis report

Static analysis result for SHA-256 59444bea4bfd3851…

MALICIOUS

PDF

135.1 KB Created: 2021-07-04 00:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f95abf67f702d3441dd0a49c97295b57 SHA-1: 9b18c13829568392959e0857d508ebc535b15863 SHA-256: 59444bea4bfd385137094d071414b337ecd0eaec4aef5fc405353cba3f4f516d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the Formcraft plugin, suggesting a link farm or phishing infrastructure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 https://philabc.ru/uplcv?utm_term=current+atmospheric+co2 PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e366f57bf1---54724012598.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/65661526870.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a50557d4b14---zakirabakujenezumix.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094782817783---kosumakemirurebabarizigu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vk9d859nbaq950en3k24t4ela4/7298080542.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/61681968209.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5a8a4838---80124087611.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd66c880e---61685773388.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2e355fa7552f6a43130a65bdb379d0a3/vejira.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/82593140853.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f45d0d8---zokedalilojazizuf.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/95174519251.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/2241524562.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160905745e1f10---zufosugewukoziledovawe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861617968b---63663915644.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624213753_f798wm.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aeb0978dbaa---79006412121.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162336399929.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8d2624331b197ab0cb1ad7bf79ec7383/nagitoribubulibu.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/kexixofu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/guvamuwolivulujatofatuvu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2ef32d7---kazexozepopizizaw.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3adebc824f951a9b6af00292a3c49848/torivurujinotiwofemi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/mejodotoxagoxafomepewel.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f80b8f103---xizebadi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cb89ceb9c5eb090d790f9029fb86caa8/mebeke.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_off0001aa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C299 10844 bytes
SHA-256: 90576296a51c87f24776d907975074dde47c8a8730d38f6c6fbec3a0b7ede1e0
font_02_sfnt_off0001db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB84 19380 bytes
SHA-256: 45967500c5aa718ce34984aac623a0ff7116dc0c6583228cbfbae6e06870838d

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