Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b1c159b9ba229e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 18:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5eab9fd484cf02c0289ea1079f73271f SHA-1: cafe167e5b24717afb7f084fb642ce8647bd38d0 SHA-256: 61b1c159b9ba229e2a92a81012e047ee4b1dea4c2884111d536284207f3b52cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate the presence of link farms pointing to compromised or disposable hosting, suggesting an attempt to obscure the final payload or distribute it across multiple locations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digitalqwerty.com/ckfinder/userfiles/files/3433753795.pdf In PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/764e73542b6f5f915ca162ced01b88f4/97344932484.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ninepobopetokiralele.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/53098831703.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/65536494655.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/41900508171.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109120306259379.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/71274787980.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe26e4eca5---jabojelojipeved.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/31557318566.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/xifazajuvoguzotitan.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/napakuzepi.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/67473832901.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/20798082740.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/90153792393.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/munufazapinetakojoxenel.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc491f3eb4---82869933024.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/nefigujered.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65068342280.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/076fff0fd82b9156983db66665eb5b9a/14001327775.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bokovamovox.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/80892895690.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/titanekezufetilopiwure.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/43927235461.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/mojifulirazazakada.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b31333bae---sijoxegazexorani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=last+day+survival+downloadPDF 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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 17560 bytes
SHA-256: ce6f07a2c932b09dd3c924135e9fcf275e964ee850ed01d69194cdfa77297a97
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10432 bytes
SHA-256: d5d03ec0c206c8ebdc41a8f827242a2a7d4aca20f7d8302b7e79752807eba86e

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