Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c7c4563e7d096…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 18:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5305ba843569053d6375bcf202cf130 SHA-1: 20be695a2dcff66960988c56d81222c3991e2894 SHA-256: c38c7c4563e7d09623ae9fd685ca9b39829e0dead5d23f3ede019129a7495a78
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://streetnn.ru/data/upload/ck/files/pazizexewufege.pdf In PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021061601052_81689260.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834b22725b4---wazulosi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca52da80d---11657289702.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/50deecc0554c3d6caf435d057528fa87/77043302008.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/44419772379.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526200222426320.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9145fc765dcb9af5f03dc0e9dc05e769/40413449987.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/97936121756.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/batudavoxopa.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/69067988372.pdfIn PDF document text
    • http://art-ball.net/files/file/81746731110.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/29836909940.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wunozuradenegataletujaf.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tupukeb.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/xilovenafibebudunizaz.pdfIn PDF document text
    • http://lscapital.it/images/file/3036508884.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/51482735810.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zojikadodifabiwuwopomoku.pdfIn PDF document text
    • http://onelove.cz/file/72741552590.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160fcdfeb7ad1f---97735290707.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/49262189694.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/27581754656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=weighbridge+system+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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10760 bytes
SHA-256: 61d7ac384f0f9a68304d3391dfe10e5d06b3e48338f90094926ef11c19843dc9
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 17580 bytes
SHA-256: 5284a9b2961d0742e6a86eaaacdb8796b0e2e9437b71883696634e3aaf686239
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.