Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b6d659509e355d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 17:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9045d6c8a0164459c2dc87a5b08e696 SHA-1: ca17c3cf2e97c8d8488f007064417167b5b7cccf SHA-256: 77b6d659509e355d948d58f4e3d7678da40d6b9eb1d3de9c3709577f8c1680cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these links, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=config+tools+apk PDF link annotation
    • https://siangyun.com/upfiles/editor/files/zezasizuvemujogazabe.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/bopulozufawufifivejexizik.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/refuwujuwapelebameb.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/ditanujedetejor.pdfIn PDF document text
    • http://esistore.be/userfiles/file/dapaniropiw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6468899b---28183619866.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/kixidovowoloxoragez.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/bijiwijemubipa.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090910213250.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/29985904708.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/51089646457.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/xazekuzax.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/migixipizawunotu.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906075042_1585742147.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/23879621484.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219841342357.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/70578374843.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/penigujujuji.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/1400027620.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/femowuvuleditulejefipugi.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/62081227835.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfe3397jvnh89ev6hij2h7g9cg/67689853834.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/lexetonawuxop.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/37746756388.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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 10424 bytes
SHA-256: b9e2b1d6cfbba5e5ef99ddd48115addb60d6e835485b6972804650d82139f677
font_02_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 19836 bytes
SHA-256: 6072cb8bd0ac4d52ca84a43c9d1efddc2088cf8a3ffd99a63da9d97dd40a6fc8

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