Malicious PDF — malware analysis report

Static analysis result for SHA-256 15368968cf8dc61c…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 22:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 391c982410853b91680e794be4536267 SHA-1: 45e114828b35352d3fdcd2d240a1d089ec423c85 SHA-256: 15368968cf8dc61ced2b2735594716cfed23a68e491b29c7c73ce4ef2922a259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://grandrosso.com/js/upload/files/jerewinelopavoxepofak.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160839847cd575---torikabe.pdfIn PDF document text
    • http://berbun.com/user_img/file/46586073323.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0b002e9a82303d3501a62d53813369f5/suwinimuzodolofege.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/68447297718.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210620221735.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ea5bedfc---50119071528.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a111f35b465---53481887270.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/l4tt0db6ja1vi6kcsst1sandtt/doxisilurofixixuloninigo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c5d62297---gavopepafune.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9f8d93c37ae985020689ce66efb1612c/zajavanezovekifusekulo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6d00102a2cc6dbbaabb6a56ec328e6a8/68732341147.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa7ca7eb0---4137020257.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723deac0830---dawaxosobexekegeke.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084525a23854---bedunetulesoderililavewe.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89afecf91---12990078203.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de655cf11---pepemeboxogopele.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/totozewuxu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/figije.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/fejinezonizulaja.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3bno2v97mlitsb4pokqqaf6rfj/598080365.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5284d4508bdf72ca7605174e7960c82f/ximokez.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9a7e812e60bb4e087ec66987ba7e1ac7/bezusamelixonojababejegif.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/49841450603.pdfIn PDF document text
    • http://qzgj.cn/upload/file/zifum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=changing+adjective+clause+to+adjective+phrase+exercisesPDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16604 bytes
SHA-256: 060a94204aea79de96caa01c0c339bc5b39768ba3062a516c412bb27cf1f2a7b
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 11220 bytes
SHA-256: 29c82e47de9d319dd4ec643bad73726d21a4beb7cb6fd70e77bfbd4aae28089c

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