Malicious PDF — malware analysis report

Static analysis result for SHA-256 594ff2df720ca16a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 00:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a43764a5f094f7122fe63fa6b730dfb4 SHA-1: 845f0a20d8b7eb733569ba780a50594341ace9f2 SHA-256: 594ff2df720ca16a987a4e2e28639c074824242a895a63eb1721ae51300b1a6f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded JavaScript and multiple links to potentially compromised WordPress upload storage suggests an attempt to deliver a malicious payload or redirect users to a phishing site. The document explicitly instructs the user to disable security software, a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e6eaca18---52922101868.pdf In PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dibupamediboraralavoj.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/jotunu.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/bekunebetipupakevisu.pdfIn PDF document text
    • http://cortabellanews.com/userimages/nigaziju.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/86309274840.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sadubuwuzesaripajak.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467a761ff63---rekevafudowedurevigojalul.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/98597640529.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210901_26788BDB25405624.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/vijanosote.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33249980572.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a6f45ef3f---65776073543.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6a8a9e98---salemotetuxobibebave.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/kexabubufutotepuvejumokot.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/77442821897.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/dimewovok.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/7284201441.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/1200234003.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/dekakulol.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/reteveso.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/20991608677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1mobile+app+storePDF 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 18212 bytes
SHA-256: d8240ccfea9648275821966c522ede6f035d62a038dd417be75c004ba2386632
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10404 bytes
SHA-256: 34a8f1d81cbc27c75153c721da4b04fbe58be56c3a53f7ca6106edfd99888624

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