Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24c9ee085dca38e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 03:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f252e755a40850c2b1eedd0e34c4459 SHA-1: fe87396fd418428ee513558aab96e0b1e5e97bf1 SHA-256: e24c9ee085dca38ef18ae2ec6b17694d9446d0e80bcf2400d6a29bab544f5212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=rawlinsons+australian+construction+handbook+pdf+download PDF link annotation
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sumusivivo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac10cc8a47---39383085313.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/lonosowawunolejazul.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/nobewori.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df9fdc6cb1b13c3fc173ae0a6fb3e066/21957594538.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/ximelusuvazu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee8a1f4b1b9f84bd91e20fec5652e7fb/wenesarekuwixomis.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee05630b799e3378dd6dab32ebb91/59458529589.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/32448343277.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/04248c9m9js9bra30hor7h3vcq/zetuvabodubot.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8d628052eef7134b2a1613873ae3fc81/vomawip.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tn4pqi0r0kb3v0thhq0o2t0ba2/88198036919.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/rateze.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6cfa6b75---bugetoxojovovasuvare.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/45795177247.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/40809272702.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea39d0e42b---wisisuku.pdfIn PDF document text
    • https://schmitz.cz/res/file/56428415325.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/32347099957.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f07cfd06329bcb1cbeff36703aeb416f/vibodumekusepomigaxi.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pazilepegulikejubire.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/98597399092.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/jti8lsphtdpgs9s8if4v97jiie/68251858415.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/47262121415.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/61489307952.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xikolaz.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_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 17832 bytes
SHA-256: d77e89c923fc8c2df60d3ae8c1c3a53cb2086a78585916e7943f89e0c633691a
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 11048 bytes
SHA-256: 62fa5d2552df75ee2c0d14387002496febc0729de0d27bcff612f4075b05bf2d

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