Malicious PDF — malware analysis report

Static analysis result for SHA-256 4343e23027e55a58…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 21:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19b5a7a5ec17afaabb2d632cd9e63fc7 SHA-1: a054980cba9ac39a3950180dc9f5eabf3b8d032a SHA-256: 4343e23027e55a585a649b6815c433a0f7b0e54b42d288d5731238443dec4e6a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://coretry.ru/uplcv?utm_term=best+handwriting+in+the+world+pdf PDF link annotation
    • http://angelcabrera.com/FCKfiles/file/83811625661.pdfIn PDF document text
    • https://efnnma.org/files/file/mepalewatikamibeliwulo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/76563649929.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jesumakebakomuxosudodi.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b4877defa2a---soxefozikisepanam.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/89986163359.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/95480850173.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/54470821521.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/92556375221.pdfIn PDF document text
    • https://mavibusiness.it/file/vedelibod.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dasaxemonogi.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210816104828.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/75850914703.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9rplgp275q60qcsg2on92pqtv5/63908466200.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/joxowiwokes.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/rafanuxurunil.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nbdvcfhgmvivf7l2gsngfhvorl/jogukabizufufeburafono.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7927edf9ac055a15da7a7e7d9947915c/tojatefaxazufubowejakim.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wagoresovaxilawenuvi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1c1822a12433cd63e2af1dc6bf27c091/94267424366.pdfIn PDF document text
    • http://bociany.sk/media/file/64523148385.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d368796f---34870092816.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b17ded2e4---31003710862.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/82379919941.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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10916 bytes
SHA-256: 1bbdd69214de6c4c2b9926594a2389e30426cec995a73658bc4c29d7f17ca2ba
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 17332 bytes
SHA-256: 2b98e206de54917a2dd62d487dbe08d8963bb1c21465a0aa2edc5e078ec3ae7a

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