Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b52b1724634e75…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 10:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c9d444115448bafe8120b2d84034824 SHA-1: ebbbde9039a767acc309074e741e3fef7b355570 SHA-256: a0b52b1724634e75d08651d00360f4417095cfa4448d620baf067bbf20a400e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lobi.md/userfiles/file/vuvedugitugapeku.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/nevak.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/877895ed4be29f76ee18f323b62cccf2/lifipojevuwobirisikubejut.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/kalijafosasevopoliwe.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/siduxorokadukakuzobi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///bamuvox.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ec0bdc73---90604785115.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/93884712470.pdfIn PDF document text
    • http://anpo.vn/upload/files/83244949733.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503043036039038j5xln1.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/3230590597.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857b5a707d---lenogumewamiv.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cub89viocvjch035dndbihddso/garijiwimiramulagifu.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/52246960353.pdfIn PDF document text
    • https://datawire.gr/files/files/tufofoz.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zufaboxibudebulajew.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/93694713729.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd35f2f922---fogosubuke.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/13558266354.pdfIn PDF document text
    • https://salwangurugram.com/files/91280170638.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/kikuzerinirunelif.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160846535c3818---batefadufogo.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/97657810770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jurassic+world+alive+hack+androidPDF 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_off0000bf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF83 10704 bytes
SHA-256: d6d5d293faea9775b7ba2216fa3cb233ac70ab882ce4fdeafb6d768e45b315a9
font_01_sfnt_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 17176 bytes
SHA-256: b3712f90fca5b02ae24b04fa1d5e4f8b5687d88e06db859752c9c491c18e8f4f

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