Malicious PDF — malware analysis report

Static analysis result for SHA-256 257492d1959b1c5a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 05:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d0d43dbc93988d6eb03e60e1faf2bba SHA-1: edafee1104785f17f42d0600e2ce1a76ebc099e4 SHA-256: 257492d1959b1c5ac072aae76378910e30238cb699b945ac521fb82da6d79305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload storage or other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://netpage.info/userfiles/file/17174621188.pdf In PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/wabifogavu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b396d46574---41782692870.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/furep.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7a0d051f---33952759434.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/20180248524.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/fumirukuremevefaveb.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/64142864459.pdfIn PDF document text
    • https://agermag.ro/mm/file/6561313358.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wimifurutu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/81860839090.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/86660622136.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/53565466476.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/90n5g4c87cls7k2vuphg8hs1oe/wojabumulitutik.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/fadufuwitu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/panuvoduwutitebikegizari.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taporuweges.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0021f072---tijebuludowopiwu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a9c1ab71---46074474260.pdfIn PDF document text
    • http://zimmerei-possert.at/karuruxadopam.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/movuxanumaweguxodekatazu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcf3165dd---36407242022.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11343056630.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jonopenawore.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b24110ca---goveli.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255f2dec68---dosovodox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watermark+pdf+freePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/pijizoko.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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10216 bytes
SHA-256: 93630ee272343642e84390ed56d1390549b830f8bbe9698d3eae12f9ae14e2d7
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 19100 bytes
SHA-256: 1fd054c23f035f93b73dd6ae75cffc6e9ae664361bda0f46c94d8de82f969923