Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cb237a1d44e3f7…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 21:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fb41da31614a2714e9fedb8db626231 SHA-1: bb9fd2c9d489a0dc0c805fea13f6e74073c9012f SHA-256: c4cb237a1d44e3f7fbf05881110fcb7bd7b31da5bb54d06fbac3252fe73e0204
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external links, including those pointing to compromised WordPress uploads and disposable hosting, suggest it's designed to redirect users to malicious sites. The presence of embedded JavaScript also indicates potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=watch+fast+5+123movies PDF link annotation
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sikixiruxijovivirewotip.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf313671---88565423753.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210918084900.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d31cb621---vopesa.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210907022004.pdfIn PDF document text
    • https://biomisszio.hu/tmp/rabadizegutifaxovir.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/175061236130e65e14797.pdfIn PDF document text
    • https://angkalaris.com/contents/files/2243034997.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/87966574356.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k1j8cl4j2evk4g0bd9albmucau/fokexilekuloxowenuxogofel.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/dapavasamikipu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/89797298481.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/18033996509.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/5956683080.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/27855750156.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/66c509927d47786d22b57a23903115c9/jomapiwegabogufuma.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/41302013886.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/25573666555.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/fileber.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/53216287205.pdfIn PDF document text
    • https://parc-hotel.info/file/puvekebimomi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45a58bd0c---87355925969.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd31ebf17---7501180429.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_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10888 bytes
SHA-256: 47c76781c422ab947452f9879db4ab1f47e03e65fe90aa28f955b3fcb0b6b848
font_01_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 19868 bytes
SHA-256: 6b14969c25b099d00bc04b4b813c887d40dd64038c660c64bc2352faffca00a3

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