Malicious PDF — malware analysis report

Static analysis result for SHA-256 400fba78f7e868d2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 16:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 491453bc5e72f8b2564744e69a9ac2e7 SHA-1: c0253a2a3b8e34a73ffed69b63c37a05e6847219 SHA-256: 400fba78f7e868d2d7bdb5b3dc60b27f0e7f4d6a0fd70d7fceb1628a95d0d519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous links to disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://murielbellhomes.com/userfiles/files/66377031141.pdf In PDF document text
    • http://plkorea77.com/ckupload/files/japinegijumipekiv.pdfIn PDF document text
    • http://scsychem.com/upload/files/pikepa.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/16075169495.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pijisonew.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/60263525074.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sirobuxijisinexega.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wulisijojepavupe.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edc8efcff10d41211a6075e1678e1b81/linet.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cddba1aa8a5a17272fed5648e0318bdb/71658619494.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/pumiluguziravuwufemov.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2hdbrhubhs79o3kqp9tgi1fs26/70843775046.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5bbbe096---68227017852.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/mewemepubusesepifono.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31408507409.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/xuwilifusag.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/foguposakon.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nibiporo.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zixidataxovifuletagavatem.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pebodulimedukosuxuzavev.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/38382621755.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/96458000417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=poco+c3+hard+resetPDF 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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 16376 bytes
SHA-256: 7a8101f8455df480aa9b9b7ada2a17b22d9a5a31f5fb36e171ba19f58fa841fe
font_02_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10396 bytes
SHA-256: db70a3b6338f4f6a38f0d22c6791d4bcba642d9b92e4c88bf947224cb0a34c6d