Malicious PDF — malware analysis report

Static analysis result for SHA-256 954d091555593aa5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 15:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a435eeaf0ddd262eb080a47b35f78ff4 SHA-1: 20a0972f42152b6edfac8478dc69ce7fcaaa1476 SHA-256: 954d091555593aa57e894bf576fa45f86ec4c7c24afa2a14f65f8ac8aea51018
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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
  • 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://bestbelly.org/content/files/files/zemuf.pdf In PDF document text
    • https://vnmmalta.com/userfiles/file/gidebexa.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/41840687519.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gawobemuzogog.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pigeloruk.pdfIn PDF document text
    • http://ihdbd.org/upload/files/67584370563.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sawulet.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63837455735.pdfIn PDF document text
    • http://momsystem.ru/public/file/92363335714.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/gunemumisu.pdfIn PDF document text
    • https://onwater.my/uploads/file/95876400800.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d504a6746d826f0a2c59f96d5da13ae2/fatojogininewo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efbd59468a---74339977369.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/goxumexukoxuzef.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/71718448094.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/3794008277.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/96089283126.pdfIn PDF document text
    • http://stroi-sistema.ru/img/95725735248.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/94298233686.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/89474038155.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/satum.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/munajukapevagozananubil.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38524809804.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bamafejotuvupogamexe.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/51095657306.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7843a35ad---75710522256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+my+phone+appPDF 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 17876 bytes
SHA-256: 5e00c85c230ca2c2dba7914cc0d5df235b7768350989ea6a479159af6f0e6406
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 10440 bytes
SHA-256: cafe5c0480883272d1d930b0525130f8b213156117ff8ec0c8f097c94192749e

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