Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3ac5195df8cd6a…

MALICIOUS

PDF

62.3 KB Created: 2021-09-07 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21115b3511c81d8a16cac7c289693849 SHA-1: c5ba16f3fb432975de8b24194439bc17c40e39ac SHA-256: 4d3ac5195df8cd6a09edc512e92817705fbd2c8161f18ce485d5a50fe660ce9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://artospace.com/pics/file/76177436949.pdf In PDF document text
    • http://kxqcgs.com/filespath/files/20210906140357.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/db55c8627dcefcf4f6c526ba7cfcba52/90031253510.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/176f1c5871b96d5a7190ee96bdafc547/xadikexezon.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sijukixode.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/089de3398a390ea3fdd565056895ab85/59890614797.pdfIn PDF document text
    • http://djpress.pl/Image/files/32630651439.pdfIn PDF document text
    • http://allycatering.com/userfiles/watikalomafa.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/13893369139.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/36842695499.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/24635699751.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/89532940679.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/lesepojaja.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/25186880569.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a028552b94---7946005641.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/xedabudorigogaw.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/ruriz.pdfIn PDF document text
    • http://majcentrum.pl/user_uploads/file/buturonugifekatojutuminu.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/bufajanevatikozibegenare.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111944dae06f---48484481868.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/16081765921.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210508171806.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09f9146ee---raxudufesijebezivizu.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xupumakexejuguperizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=era+geometric+design+manual+2013+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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