Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a10ebff0be53b4c…

MALICIOUS

PDF

79.8 KB Created: 2021-10-16 00:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7c72ee2fb7a84e681cfc2d947138775 SHA-1: 2d0479ccc89781f34040020232b6b4471c6645b3 SHA-256: 2a10ebff0be53b4cdcc17e7e090038bef829797f7819bed9f3277f9d2c6e51fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to various domains, many of which are identified as a link farm on disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 http://jujucuisine.com/userfiles/file/digetekuzarukoxenevit.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/85048534038.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/sumotufitovavijidilogenar.pdfIn PDF document text
    • http://vswet.ru/f/99541938886.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/gajalovopalefetovikin.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/zirafak.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161507d6328566---wizuvizoxagulalo.pdfIn PDF document text
    • http://skupka54.ru/upload/m/mewagiwujumima.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/basasakonogirazagomab.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/89033918043.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1632769955.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/vuxevamunulodesodinoraz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8d80bec7109b41d7d1e74a4c04a23ada/51970486386.pdfIn PDF document text
    • http://inica.org/files/file///23804393196.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76612617572.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/sagewetigi.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/63946754593.pdfIn PDF document text
    • http://plncse.hu/php_data/file/jufabi.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/pozarunufizababilat.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/piwaliz.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/268730379.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/im1f4lted0f4f5g56kh3c2a82e/xomaxamitadupixoziset.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b43b747e82---divolonivepipuzakox.pdfIn PDF document text
    • https://linker.tw/files/7693843998.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/wodimuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=total+stopping+distance+formulaPDF 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_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 11024 bytes
SHA-256: 19ba417ac60f1a6ca621878a080a91df453dc2920ce94e1e76c59e81c9553ebf
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 17300 bytes
SHA-256: 8876ca6f009fb6dee5db204b9fee6dc7a25aaec57ac731f20dc3a160e584caaa
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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