Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e77593d8310060…

MALICIOUS

PDF

77.3 KB Created: 2021-08-11 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb1e5e0a5a2857c5b045f06ff44c628a SHA-1: fd1a4fd904a0ec608a29593d02707705e67ffa82 SHA-256: c4e77593d83100603742e6b257d95e052d9a0782e436cf7d136a04a42c13bdfe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://master.plus/wp-content/plugins/super-forms/uploads/php/files/a9339cf06f8ffedfd9f98b41e694f5f2/jobovazinufevevugada.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082311dae146---25839818270.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/50117230925.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202172145539.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tujulemaremetaxubijojewak.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ace3f7131132be6d27e71e473209ee20/woxigilagik.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607875cd3abee---43375500343.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f138a76cc0f01210b21ab628718425fd/8333246455.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160943460d78ac---xenibulexetikipima.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d337dfb00---belefakebuniwiju.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fawukatedopomid.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0541b0588---lurosozewu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/wimiluzo.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210629_79BD9E65D2C6FD9A.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb4508f6a---rukagugezadumuzilek.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/87473647036.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/37420690190.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e9e9ce036e40d71a00ef42266d6a781/37460852523.pdfIn PDF document text
    • http://cmtsport.com/pliki/33101579545.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/mupadobizepijep.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bbbcc6a1---murawiwogo.pdfIn PDF document text
    • http://sintaxisfacil.blogspot.com.esIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=subordinadas+sustantivas+ejercicios+pdfPDF 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_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 16752 bytes
SHA-256: 160bf8bb6c3ff02bb7990906f47ad1bf5e64c0af2a4f1a1b88106fe89102eff9
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 11076 bytes
SHA-256: 2ed7042b9a529a993841c9c012261897d15b959c5373ccb539b402c085f1a3ae

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