Malicious PDF — malware analysis report

Static analysis result for SHA-256 7768e78bec228934…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 16:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 029d4d58c78dcaa2678f6e2668e7f33c SHA-1: 6bb01763674d42fc04c5bb576ea32126c59b7a75 SHA-256: 7768e78bec228934222801c28ce63133be4204f0d49dfd0ceab67472d56d8062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing an embedded JavaScript stream and a link farm pointing to various disposable hosting domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's purpose is to act as a link farm, likely to distribute malware or facilitate phishing. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fujieshubao.com/zk/UploadFile/file/2021082516563573499.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2qj8rni5r1v8983gf2hbfn9bu1/netedajokose.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750e6c7354---61515468999.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/v36tf1dplf17e8sg0g4eocph8f/49946641790.pdfIn PDF document text
    • https://okazionche.com/files/zesogogigomane.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1a39fa2b40224d3d0a0f3f7c8ba2801e/zogeboxap.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/43066329262.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc252ae41---pozobezewiludo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b10f4f5a7---wuxurugaviporuseliwibo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/abkgfue002q0asl2ac0rhr03jg/nuwejeri.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210620_6B83C40EB6342FA3.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/77058411276.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e67e79ec7---wibofakukebunoxazoxitumuj.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/56005713306.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/27972849543.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/rojibovapuxali.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/livifunilimuxibovuleliwez.pdfIn PDF document text
    • https://masihpt2.com/contents/files/23592041325.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/30657275876.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/nidurirakuzeditoz.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pexubojimetiputikujev.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/79e35ffc59570aeb3868154adb2ddf84/gineputokujarefajuzi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zotofujizokatojig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quickbooks+2015+pdf+repair+toolPDF 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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16428 bytes
SHA-256: fac648edb57a2a750a3bb7d5a150a9897783d632b3270380a00a26db040d2993
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 11328 bytes
SHA-256: bbbd3292b5e176a4ea04f5761a015862fd0a2fad7dc42c950d1ee3ef8d5fd154

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