Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f9b628e7430a6c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-30 07:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a8c4dc1444badee633380b2912d20a4 SHA-1: f2f87d71f4df7195930a6ee68c7aa3f33787df1b SHA-256: 25f9b628e7430a6c080cc30fb7a97a1ac40ac2fcf0276dde0e9c0de85218e26b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised upload storage and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious sites or download additional payloads. The numerous external links, many hosted on potentially compromised or disposable domains, reinforce the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://calendarsunrooms.com/userfiles/files/14407720751.pdf In PDF document text
    • http://pitin-akutsu.com/js/upload/files/farometudup.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ta0su7ea6l5b5hbpeoc3j016af/rulufufisozawarorifi.pdfIn PDF document text
    • http://sb-78.ru/files/file/surugujo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747a73a826f---remurogefimogirikevolon.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/50896483390.pdfIn PDF document text
    • http://fullx.net/files/18567075331.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/s740f2ucihk3l4pg8ihb3bngga/vuvelowidu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdd34ad6e---rineriroso.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/putoxilasunelugezoro.pdfIn PDF document text
    • http://sushi-belovo.ru/files/38051378777.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/63598144557.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ripapejitenepaxif.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dojojo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608900605d894---62528237443.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/jesuzaxupi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ba066451---zasakukinugegukisopimu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/gixotodazinakuvadu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/130e3e453ef2f47820e9cf2edc5e2ae2/29567517164.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/73571098995.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44001099423.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tozudogawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+measure+frequency+with+a+fluke+87+multimeterPDF 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 11388 bytes
SHA-256: 1086d03de8fe3f7023c2e03201193617dda46b06321cc4d043a88cf0ee5e5de2
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 18752 bytes
SHA-256: 1b48c4310f81de61b45ec6129e3351ba990f4d08217ddef16cea0e5076525901

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